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(-1/7)*(5*x+8) = -53/7 // + -53/7
(-1/7)*(5*x+8)-(-53/7) = 0
(-1/7)*(5*x+8)+53/7 = 0
53/7-1/7*(5*x+8) = 0
(-1/7*7*(5*x+8))/7+53/7 = 0
53-1/7*7*(5*x+8) = 0
45-5*x = 0
(45-5*x)/7 = 0
(45-5*x)/7 = 0 // * 7
45-5*x = 0
45-5*x = 0 // - 45
-5*x = -45 // : -5
x = -45/(-5)
x = 9
x = 9
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