Ответ:
5x+21-7x=15-6x-6
-2x+21=9-6x
-2x+6x=9-21
4x=-12
x=-3
5х+7(3-х)=3(5-2х)-6
5х+21-7х+15-6х-6
-8х+30
Жауабы; -8х+30
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Ответ:
5x+21-7x=15-6x-6
-2x+21=9-6x
-2x+6x=9-21
4x=-12
x=-3
Ответ:
5х+7(3-х)=3(5-2х)-6
5х+21-7х+15-6х-6
-8х+30
Жауабы; -8х+30