Пошаговое объяснение:
1) 3х + 51 = 6-12
3х = -6 - 51
3х = -57
х = -19
2) -3х -21 = 81-84
-3х = -3 + 21
-3х = 18
х = -18/3
х = -6
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Пошаговое объяснение:
1) 3х + 51 = 6-12
3х = -6 - 51
3х = -57
х = -19
2) -3х -21 = 81-84
-3х = -3 + 21
-3х = 18
х = -18/3
х = -6