Question

120+(x+85)=250; 80-(4-x)=78; 3x+4x-x=18

Answer 1

120+(x+85)=250
х+205=250
х=45

80-(4-x)=78
80-4+х=78
76+х=78
х=2

3x+4x-x=18
6х=18
х=3

Answer 2

120+(x+85)=250
120+x+85=250
x=250-120-85
x=45;
80-(4-x)=78
80-4+x=78
x=78-80+4
x=2;
3x+4x-x=18
6x=18
x=3