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