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4*x-3 = -x-1/7 // + -x-1/7
4*x+x-(-1/7)-3 = 0
4*x+x+1/7-3 = 0
5*x-20/7 = 0 // + 20/7
5*x = 20/7 // : 5
x = 20/7/5
x = 4/7
x = 4/7
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