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(1/2)*x-(1/7) = -3/5 // + -3/5
(1/2)*x-(1/7)-(-3/5) = 0
(1/2)*x-1/7+3/5 = 0
1/2*x+16/35 = 0 // - 16/35
1/2*x = -16/35 // : 1/2
x = -16/35/1/2
x = -32/35
x = -32/35
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