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(6*x+1)/7-((2*x-7)/3) = 4 // - 4
(6*x+1)/7-((2*x-7)/3)-4 = 0
(6*x+1)/7+(-1*(2*x-7))/3-4 = 0
(3*(6*x+1))/(3*7)+(-1*7*(2*x-7))/(3*7)+(-4*3*7)/(3*7) = 0
3*(6*x+1)-1*7*(2*x-7)-4*3*7 = 0
4*x-84+52 = 0
4*x-32 = 0
(4*x-32)/(3*7) = 0
(4*x-32)/(3*7) = 0 // * 3*7
4*x-32 = 0
4*x-32 = 0 // + 32
4*x = 32 // : 4
x = 32/4
x = 8
x = 8
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