14х+7-18х+6=84
7+6-84=-14х+18х
-71=4х | :4
х=-17,75
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14х+7-18х+6=84-4х+13=84
-4х=71
Х=-17,75
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14х+7-18х+6=84
7+6-84=-14х+18х
-71=4х | :4
х=-17,75