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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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