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(4/9)*x-((2/9)*x)+8 = 18 // - 18
(4/9)*x-((2/9)*x)-18+8 = 0
(4/9)*x+(-2/9)*x-18+8 = 0
2/9*x-10 = 0 // + 10
2/9*x = 10 // : 2/9
x = 10/2/9
x = 45
x = 45
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