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(4-(7*x))/15+(1-x)/3 = 4-((2*x+1)/5) // - 4-((2*x+1)/5)
(4-(7*x))/15+(1-x)/3+(2*x+1)/5-4 = 0
(4-7*x)/15+(1-x)/3+(2*x+1)/5-4 = 0
(3*5*(4-7*x))/(3*5*15)+(5*15*(1-x))/(3*5*15)+(3*15*(2*x+1))/(3*5*15)+(-4*3*5*15)/(3*5*15) = 0
3*5*(4-7*x)+5*15*(1-x)+3*15*(2*x+1)-4*3*5*15 = 0
90*x-180*x-900+45+135 = 0
180-90*x-900 = 0
-90*x-720 = 0
(-90*x-720)/(3*5*15) = 0
(-90*x-720)/(3*5*15) = 0 // * 3*5*15
-90*x-720 = 0
-90*x-720 = 0 // + 720
-90*x = 720 // : -90
x = 720/(-90)
x = -8
x = -8
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