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15*x-(20*(-1/5)) = 7 // - 7
15*x-(20*(-1/5))-7 = 0
15*x-7+4 = 0
15*x-3 = 0 // + 3
15*x = 3 // : 15
x = 3/15
x = 1/5
x = 1/5
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