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x in (-oo:+oo)
(-4/7)*x-(5/8) = (4/7)*x-443/504 // - (4/7)*x-443/504
(-4/7)*x-((4/7)*x)-(5/8)-(-443/504) = 0
(-4/7)*x+(-4/7)*x-5/8+443/504 = 0
16/63-8/7*x = 0 // - 16/63
-8/7*x = -16/63 // : -8/7
x = -16/63/(-8/7)
x = 2/9
x = 2/9
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