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7*x = -3/4 // + -3/4
7*x-(-3/4) = 0
7*x+3/4 = 0
7*x+3/4 = 0 // - 3/4
7*x = -3/4 // : 7
x = -3/4/7
x = -3/28
x = -3/28
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