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3*x+(4/4)*x+7 = 3*x+(5/4)*x+2 // - 3*x+(5/4)*x+2
3*x+(4/4)*x-(3*x)-((5/4)*x)-2+7 = 0
3*x+(4/4)*x-3*x+(-5/4)*x-2+7 = 0
5-1/4*x = 0 // - 5
-1/4*x = -5 // : -1/4
x = -5/(-1/4)
x = 20
x = 20
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