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-(2*x)-(5*x)-7 = (1/4)*(8-12*x)-9 // - (1/4)*(8-12*x)-9
9-((1/4)*(8-12*x))-(2*x)-(5*x)-7 = 0
(-1/4)*(8-12*x)-2*x-5*x-7+9 = 0
9-1/4*(8-12*x)-2*x-5*x-7 = 0
9-1/4*(8-12*x)-2*x-5*x-7 = 0
x-5*x-7-2+9 = 0
9-4*x-7-2 = 0
9-4*x-9 = 0
-4*x = 0
-4*x = 0
-4*x = 0 // : -4
x = 0
x = 0
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