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7*x-3 = -33/4 // + -33/4
7*x-(-33/4)-3 = 0
7*x+33/4-3 = 0
7*x+21/4 = 0 // - 21/4
7*x = -21/4 // : 7
x = -21/4/7
x = -3/4
x = -3/4
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