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3*x+7*x-9 = -43/7 // + -43/7
3*x+7*x-(-43/7)-9 = 0
3*x+7*x+43/7-9 = 0
10*x-20/7 = 0 // + 20/7
10*x = 20/7 // : 10
x = 20/7/10
x = 2/7
x = 2/7
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