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(2/7)*x+3*x-7 = -121/14 // + -121/14
(2/7)*x+3*x-(-121/14)-7 = 0
(2/7)*x+3*x+121/14-7 = 0
23/7*x+23/14 = 0 // - 23/14
23/7*x = -23/14 // : 23/7
x = -23/14/23/7
x = -1/2
x = -1/2
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