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(2/7)*x+2*x-3 = 155/7 // - 155/7
(2/7)*x+2*x-(155/7)-3 = 0
(2/7)*x+2*x-155/7-3 = 0
16/7*x-176/7 = 0 // + 176/7
16/7*x = 176/7 // : 16/7
x = 176/7/16/7
x = 11
x = 11
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