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(3*x)/4 = (4*x)/5-(3/2) // - (4*x)/5-(3/2)
(3*x)/4-((4*x)/5)+3/2 = 0
(3*x)/4+(-4/5)*x+3/2 = 0
3/2-1/20*x = 0 // - 3/2
-1/20*x = -3/2 // : -1/20
x = -3/2/(-1/20)
x = 30
x = 30
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