138 реши

138.

1. \(3(x+7)=2x+14\Rightarrow x=-7\).

2. \(x^2=4,\ x\ne\pm2\Rightarrow \varnothing\).

3. \(x-2=1-2x\Rightarrow x=1,\ x\ne\pm1\Rightarrow \varnothing\).

4. \(5x-15=2(x-3)\Rightarrow x=3,\ x\ne3\Rightarrow \varnothing\).