Question

Answer 1

b) \(3x+43=115\)

\(\Rightarrow3x=72\)

\(\Rightarrow x=72:3\)

\(\Rightarrow x=24\)

c) \(15-2x=65:5\)

\(\Rightarrow15-2x=13\)

\(\Rightarrow2x=15-13\)

\(\Rightarrow x=2:2\)

\(\Rightarrow x=1\)

d) \(5\cdot\left(x+5\right)=35\)

\(\Rightarrow x+5=7\)

\(\Rightarrow x=7-5\)

\(\Rightarrow x=2\)

e) \(\left(3x+2\right)\cdot24=192\)

\(\Rightarrow3x+2=8\)

\(\Rightarrow3x=6\)

\(\Rightarrow x=6:3\)

\(\Rightarrow x=2\)

g) \(\left(9x+4\right):23=8\)

\(\Rightarrow9x+4=184\)

\(\Rightarrow9x=180\)

\(\Rightarrow x=180:9\)

\(\Rightarrow x=20\)

h) \(384:\left(5x-3\right)=12\)

\(\Rightarrow5x-3=384:12\)

\(\Rightarrow5x-3=32\)

\(\Rightarrow x=35:5\)

\(\Rightarrow x=7\)

Answer 2

\(b,3x+43=115\\ \Leftrightarrow3x=72\\ \Leftrightarrow x=24\\ c,15-2x=65:5\\ \Leftrightarrow15-2x=13\\ \Leftrightarrow2x=2\\ \Leftrightarrow x=1\\ d,5\left(x+1\right)=35\\ \Leftrightarrow x+1=7\\ \Leftrightarrow x=6\\ e,\left(3x+2\right)\cdot24=192\\ \Leftrightarrow3x+2=8\\ \Leftrightarrow3x=6\\ \Leftrightarrow x=2\)

Answer 3

b: =>3x=115-43=72

=>x=24

c: =>15-2x=13

=>2x=15-13=2

=>x=1

d: =>x+1=35/5=7

=>x=6

e: =>3x+2=8

=>3x=6

=>x=2

f: =>5x+4=312/13=24

=>5x=20

=>x=4

g: =>9x+4=184

=>9x=180

=>x=20

h: =>5x-3=384/12=32

=>5x=35

=>x=7

Answer 4

\(f,13\left(5x+4\right)=312\\ \Leftrightarrow5x+4=24\\ \Leftrightarrow5x=20\\ \Leftrightarrow x=4\\ g,\left(9x+4\right):23=8\\ \Leftrightarrow9x+4=184\\ \Leftrightarrow9x=180\\ \Leftrightarrow x=20\\ h,384:\left(5x-3\right)=12\\ \Leftrightarrow5x-3=32\\ \Leftrightarrow5x=35\\ \Leftrightarrow x=7\)