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4*x-((6*x)/4) = 20 // - 20
4*x-((6*x)/4)-20 = 0
4*x+(-3/2)*x-20 = 0
5/2*x-20 = 0 // + 20
5/2*x = 20 // : 5/2
x = 20/5/2
x = 8
x = 8
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