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(3/5)*(40*x+20)-17 = (-1/2)*(14*x-10) // - (-1/2)*(14*x-10)
(3/5)*(40*x+20)-((-1/2)*(14*x-10))-17 = 0
(3/5)*(40*x+20)+(1/2)*(14*x-10)-17 = 0
3/5*(40*x+20)+1/2*(14*x-10)-17 = 0
3/5*(40*x+20)+1/2*(14*x-10)-17 = 0
31*x-17+7 = 0
31*x-10 = 0
31*x-10 = 0
31*x-10 = 0 // + 10
31*x = 10 // : 31
x = 10/31
x = 10/31
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