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x+(3/5)*x-4 = -84/25 // + -84/25
x+(3/5)*x-(-84/25)-4 = 0
x+(3/5)*x+84/25-4 = 0
8/5*x-16/25 = 0 // + 16/25
8/5*x = 16/25 // : 8/5
x = 16/25/8/5
x = 2/5
x = 2/5
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