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(4/5)*x = (3/4)*x+1/2 // - (3/4)*x+1/2
(4/5)*x-((3/4)*x)-(1/2) = 0
(4/5)*x+(-3/4)*x-1/2 = 0
1/20*x-1/2 = 0 // + 1/2
1/20*x = 1/2 // : 1/20
x = 1/2/1/20
x = 10
x = 10
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