87-2х=8х+112
-2х-8х=112-87
-10х=25
х=-2.5
Проверка
87-2*(-2.5)=8*(-2.5)+112
87+5=112-20
92=92
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87-2х=8х+112
-2х-8х=112-87
-10х=25
х=-2.5
Проверка
87-2*(-2.5)=8*(-2.5)+112
87+5=112-20
92=92