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(-115*x)/(-15) = -3500/(-15) // + -3500/(-15)
(-115*x)/(-15)-(-3500/(-15)) = 0
(-115*x)/(-15)-700/3 = 0
23/3*x-700/3 = 0 // + 700/3
23/3*x = 700/3 // : 23/3
x = 700/3/23/3
x = 700/23
x = 700/23
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