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(15*x-25)/5 = x/3+7 // - x/3+7
(15*x-25)/5-(x/3)-7 = 0
(15*x-25)/5-x/3-7 = 0
(3*(15*x-25))/(3*5)+(5*(-x))/(3*5)+(-7*3*5)/(3*5) = 0
3*(15*x-25)+5*(-x)-7*3*5 = 0
40*x-105-75 = 0
40*x-180 = 0
(40*x-180)/(3*5) = 0
(40*x-180)/(3*5) = 0 // * 3*5
40*x-180 = 0
40*x-180 = 0 // + 180
40*x = 180 // : 40
x = 180/40
x = 9/2
x = 9/2
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