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(3/4)*x-3 = (-1/2)*x-(19/8) // - (-1/2)*x-(19/8)
(3/4)*x-((-1/2)*x)+19/8-3 = 0
(3/4)*x+(1/2)*x+19/8-3 = 0
5/4*x-5/8 = 0 // + 5/8
5/4*x = 5/8 // : 5/4
x = 5/8/5/4
x = 1/2
x = 1/2
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