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(2/3)*x+(6/7)*x+8 = 440/63 // - 440/63
(2/3)*x+(6/7)*x-(440/63)+8 = 0
(2/3)*x+(6/7)*x-440/63+8 = 0
32/21*x+64/63 = 0 // - 64/63
32/21*x = -64/63 // : 32/21
x = -64/63/32/21
x = -2/3
x = -2/3
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