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(3/7)*x+5 = -4/7-3 // + -4/7-3
(3/7)*x-(-4/7)+3+5 = 0
(3/7)*x+4/7+3+5 = 0
3/7*x+60/7 = 0 // - 60/7
3/7*x = -60/7 // : 3/7
x = -60/7/3/7
x = -20
x = -20
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