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(3/7)*x+2 = 4/7-5 // - 4/7-5
(3/7)*x-(4/7)+2+5 = 0
(3/7)*x-4/7+2+5 = 0
3/7*x+45/7 = 0 // - 45/7
3/7*x = -45/7 // : 3/7
x = -45/7/3/7
x = -15
x = -15
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