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(3/4)*x-3 = -9/4 // + -9/4
(3/4)*x-(-9/4)-3 = 0
(3/4)*x+9/4-3 = 0
3/4*x-3/4 = 0 // + 3/4
3/4*x = 3/4 // : 3/4
x = 3/4/3/4
x = 1
x = 1
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