(пример)
28-(3х-2)=7х
28-3х+2=7х
30-3х=7х
-3х-7х=-30
-10х=-30
х=3
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(пример)
28-(3х-2)=7х
28-3х+2=7х
30-3х=7х
-3х-7х=-30
-10х=-30
х=3