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3*x-(2*(-3/7)) = 4 // - 4
3*x-(2*(-3/7))-4 = 0
3*x+6/7-4 = 0
3*x-22/7 = 0 // + 22/7
3*x = 22/7 // : 3
x = 22/7/3
x = 22/21
x = 22/21
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