a) \(\left(x-7\right)\cdot5=0\)
\(\Rightarrow x-7=0:5\)
\(\Rightarrow x-7=0\)
\(\Rightarrow x=7\)
Vậy: x=7
b) \(x\cdot3-13=47\)
\(\Rightarrow x\cdot3=47+13\)
\(\Rightarrow x\cdot3=60\)
\(\Rightarrow x=60:3\)
\(\Rightarrow x=20\)
Vậy: x=20
c) \(135+x\cdot2=151\)
\(\Rightarrow x\cdot2=151-135\)
\(\Rightarrow x\cdot2=16\)
\(\Rightarrow x=16:2\)
\(\Rightarrow x=8\)
Vậy x=8
d) \(140-10\cdot x=120\)
\(\Rightarrow10\cdot x=140-120\)
\(\Rightarrow10\cdot x=20\)
\(\Rightarrow x=20:10\)
\(\Rightarrow x=2\)
Vậy x=2
a: 5(x-7)=0
=>x-7=0
=>x=7
b: 3x-13=47
=>3x=60
=>x=20
c: 2x+135=151
=>2x=16
=>x=8
d: 140-10x=20
=>10x=120
=>x=12
