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(4/3)*x-8 = (-8/7)*x+8 // - (-8/7)*x+8
(4/3)*x-((-8/7)*x)-8-8 = 0
(4/3)*x+(8/7)*x-8-8 = 0
52/21*x-16 = 0 // + 16
52/21*x = 16 // : 52/21
x = 16/52/21
x = 84/13
x = 84/13
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