Question

tìm x:

a)3.(x-30)+5.(-2-x) = 12-44

b)-2.(x-4) + (-4-4x) = -x + 1

Answer 1

a)3.(x-30)+5.(-2-x) = 12-44

\(\Rightarrow3x-90-10-5x=12-44\)

\(\Rightarrow3x-90-10-5x-12+44=0\)

\(\Rightarrow-2x-68=0\)

\(\Rightarrow-2x=68\)

\(\Rightarrow x=-34\)

Vây: \(x=-34\)

Answer 2

b)-2.(x-4) + (-4-4x) = -x + 1

\(\Rightarrow-2x+8-4-4x=-x+1\)

\(\Rightarrow-2x+8-4-4x+x-1=0\)

\(\Rightarrow-5x+3=0\)

\(\Rightarrow-5x=-3\)

\(\Rightarrow x=\frac{3}{5}\)

Vậy: \(x=\frac{3}{5}\)