1) 12,5-5x=0
2) 18-0,2(3x-70)=x
12.5-5х=0
-5х=0-12.5
-5х=-12.5
х=-12.5:(-5)
х=2.5
ОТВЕТ:2.5
18-0.2*(3х-70)=х
18-0.6х-14=х
18-14=х+0.6х
4=1.6х
х=4:1.6
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12.5-5х=0
-5х=0-12.5
-5х=-12.5
х=-12.5:(-5)
х=2.5
ОТВЕТ:2.5
18-0.2*(3х-70)=х
18-0.6х-14=х
18-14=х+0.6х
4=1.6х
х=4:1.6
х=2.5
ОТВЕТ:2.5