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(3/7)*x-3 = (-3/4)*x-(573/224) // - (-3/4)*x-(573/224)
(3/7)*x-((-3/4)*x)+573/224-3 = 0
(3/7)*x+(3/4)*x+573/224-3 = 0
33/28*x-99/224 = 0 // + 99/224
33/28*x = 99/224 // : 33/28
x = 99/224/33/28
x = 3/8
x = 3/8
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