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(-5/7)*x+9 = 43/7 // - 43/7
(-5/7)*x-(43/7)+9 = 0
(-5/7)*x-43/7+9 = 0
20/7-5/7*x = 0 // - 20/7
-5/7*x = -20/7 // : -5/7
x = -20/7/(-5/7)
x = 4
x = 4
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