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(4/7)*x+1/4 = -29/140 // + -29/140
(4/7)*x+1/4-(-29/140) = 0
(4/7)*x+1/4+29/140 = 0
4/7*x+16/35 = 0 // - 16/35
4/7*x = -16/35 // : 4/7
x = -16/35/4/7
x = -4/5
x = -4/5
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