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(-2/9)*x-4 = 7/18 // - 7/18
(-2/9)*x-(7/18)-4 = 0
(-2/9)*x-7/18-4 = 0
-2/9*x-79/18 = 0 // + 79/18
-2/9*x = 79/18 // : -2/9
x = 79/18/(-2/9)
x = -79/4
x = -79/4
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