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6x-5x=-12+15
1x=3
x=3 esa es la respuesta espero q te ayude y él mismo procedimiento aplicas en la otra
6x + 12 = 5x + 15
6x - 5x = 15 - 12
x = 3
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3 (4x - 2) + 2 (x - 3) = 6x + 4
12x - 6 + 2x - 6 = 6x + 4
14x - 12 = 6x + 4
14x - 6x = 4 + 12
8x = 16
x = 16/8
x = 2