7x+2∙(3 -5x) = 18
7х+6-10х = 18
-3х = 12
х = -4
Проверка:
7*(-4) +2 (3-5(-4)) = 18
-28 +2 (3+20) = 18
-28 + 46 = 18
18 = 18
Ответ: х = -4.
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7x+2∙(3 -5x) = 18
7х+6-10х = 18
-3х = 12
х = -4
Проверка:
7x+2∙(3 -5x) = 18
7*(-4) +2 (3-5(-4)) = 18
-28 +2 (3+20) = 18
-28 + 46 = 18
18 = 18
Ответ: х = -4.