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12x - 6x = -3 + 15
6x = 12
x = 2
<=>12x-15. = 6x -3
<=>12x-15+15 = 6x - 3+15
<=>12x - 6x = 6x-6x +12
<=>1/6. 6x. = 12.1/6
<=> x = 2