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4*x-6 = (3*x)/4+20 // - (3*x)/4+20
4*x-((3*x)/4)-20-6 = 0
4*x+(-3/4)*x-20-6 = 0
13/4*x-26 = 0 // + 26
13/4*x = 26 // : 13/4
x = 26/13/4
x = 8
x = 8
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