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(1/2)*x+1 = 5/7 // - 5/7
(1/2)*x-(5/7)+1 = 0
(1/2)*x-5/7+1 = 0
1/2*x+2/7 = 0 // - 2/7
1/2*x = -2/7 // : 1/2
x = -2/7/1/2
x = -4/7
x = -4/7
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