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126 - 7x -18 + 30x = - 7x - 9 - 6x - 15 - 12
108 + 23x = - 13x - 36
36x = - 144
x = -4
126-7x-18+30x =-7x-9-6x-15-12
-7x+30x+7x+6x=-9-15-12-126+18
36x=-144
x=-4
Espero haberte ayudado y si tienes alguna duda me lo dices ;)