Question

решите уравнение:
$4x + 9 = 6x - 5$
$16x - 7 = 21x + 8$
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Answer 1

$\bf1. \ 4x + 9 = 6x - 5\\4x -6x = -5 - 9\\-2x = -14 | : (-2)\\x = 7.$

Ответ : х = 7.

$\bf 2. \ 16x - 7 = 21x +8\\16x - 21x = 8 +7\\-5x = 15 | : (-5)\\x = -3.$

Ответ : х = -3.