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(2/7)*(14*x-7) = 18 // - 18
(2/7)*(14*x-7)-18 = 0
2/7*(14*x-7)-18 = 0
2/7*(14*x-7)-18 = 0
4*x-20 = 0
4*x-20 = 0
4*x-20 = 0 // + 20
4*x = 20 // : 4
x = 20/4
x = 5
x = 5
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