Пошаговое объяснение:
7х + 2(4х + 3) = 9
7х + 8х + 6 = 9
7х + 8х = 9 - 6
15х = 3
х = 3 : 15
х = 3/15
х = 1/5
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Пошаговое объяснение:
7х + 2(4х + 3) = 9
7х + 8х + 6 = 9
7х + 8х = 9 - 6
15х = 3
х = 3 : 15
х = 3/15
х = 1/5