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(-4/7)*x+8/9 = 164/63 // - 164/63
(-4/7)*x+8/9-(164/63) = 0
(-4/7)*x+8/9-164/63 = 0
-4/7*x-12/7 = 0 // + 12/7
-4/7*x = 12/7 // : -4/7
x = 12/7/(-4/7)
x = -3
x = -3
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