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(4/5)*x-((3/5)*x)-4 = 11 // - 11
(4/5)*x-((3/5)*x)-11-4 = 0
(4/5)*x+(-3/5)*x-11-4 = 0
1/5*x-15 = 0 // + 15
1/5*x = 15 // : 1/5
x = 15/1/5
x = 75
x = 75
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