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7*x+2/3 = (-2/5)*x+554/165 // - (-2/5)*x+554/165
7*x-((-2/5)*x)+2/3-(554/165) = 0
7*x+(2/5)*x+2/3-554/165 = 0
37/5*x-148/55 = 0 // + 148/55
37/5*x = 148/55 // : 37/5
x = 148/55/37/5
x = 4/11
x = 4/11
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