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