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15*x-(20*(-3/50)) = 7 // - 7
15*x-(20*(-3/50))-7 = 0
15*x+6/5-7 = 0
15*x-29/5 = 0 // + 29/5
15*x = 29/5 // : 15
x = 29/5/15
x = 29/75
x = 29/75
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