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7*x-3 = (3/4)*(8*x-12) // - (3/4)*(8*x-12)
7*x-((3/4)*(8*x-12))-3 = 0
(-3/4)*(8*x-12)+7*x-3 = 0
7*x-3/4*(8*x-12)-3 = 0
7*x-3/4*(8*x-12)-3 = 0
x-3+9 = 0
x+6 = 0
x+6 = 0
x+6 = 0 // - 6
x = -6
x = -6
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