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(-2/3)*x+(5/7)*x-(5/7) = -43/63 // + -43/63
(-2/3)*x+(5/7)*x-(5/7)-(-43/63) = 0
(-2/3)*x+(5/7)*x-5/7+43/63 = 0
1/21*x-2/63 = 0 // + 2/63
1/21*x = 2/63 // : 1/21
x = 2/63/1/21
x = 2/3
x = 2/3
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