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6*x+(1/4)*x-7 = 3*x+(7/2)*x-7 // - 3*x+(7/2)*x-7
6*x+(1/4)*x-(3*x)-((7/2)*x)-7+7 = 0
6*x+(1/4)*x-3*x+(-7/2)*x-7+7 = 0
-1/4*x = 0 // : -1/4
x = 0
x = 0
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