12-x=2-5х
-х+5х=2-12
4х=-10
х=-10÷4
х=-5/2
х= -2,5
Ответ : -2,5
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4x=-10
x=-10/4
x=-2,5
12-x=2-5х
-х+5х=2-12
4х=-10
х=-10÷4
х=-5/2
х= -2,5
Ответ : -2,5