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15*x-(10*(3*x+4/5)) = 5 // - 5
15*x-(10*(3*x+4/5))-5 = 0
15*x-10*(3*x+4/5)-5 = 0
15*x-10*(3*x+4/5)-5 = 0
-15*x-8-5 = 0
-15*x-13 = 0
-15*x-13 = 0
-15*x-13 = 0 // + 13
-15*x = 13 // : -15
x = 13/(-15)
x = -13/15
x = -13/15
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