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(3/4)*x+(2/5)*x-2+90 = 180 // - 180
(3/4)*x+(2/5)*x-180-2+90 = 0
23/20*x-92 = 0 // + 92
23/20*x = 92 // : 23/20
x = 92/23/20
x = 80
x = 80
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