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2*x-((3-(7*x))/3) = 4 // - 4
2*x-((3-(7*x))/3)-4 = 0
2*x-((3-7*x)/3)-4 = 0
(-1*(3-7*x))/3+2*x-4 = 0
(-1*(3-7*x))/3+(2*3*x)/3+(-4*3)/3 = 0
2*3*x-1*(3-7*x)-4*3 = 0
13*x-12-3 = 0
13*x-15 = 0
(13*x-15)/3 = 0
(13*x-15)/3 = 0 // * 3
13*x-15 = 0
13*x-15 = 0 // + 15
13*x = 15 // : 13
x = 15/13
x = 15/13
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