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(4*x)/5-((3*x)/4) = 4 // - 4
(4*x)/5-((3*x)/4)-4 = 0
(4*x)/5+(-3/4)*x-4 = 0
1/20*x-4 = 0 // + 4
1/20*x = 4 // : 1/20
x = 4/1/20
x = 80
x = 80
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