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3 = (-2*x)/(-18) // - (-2*x)/(-18)
3-((-2*x)/(-18)) = 0
(-1/9)*x+3 = 0
3-1/9*x = 0 // - 3
-1/9*x = -3 // : -1/9
x = -3/(-1/9)
x = 27
x = 27
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