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2*x-7 = -39/7 // + -39/7
2*x-(-39/7)-7 = 0
2*x+39/7-7 = 0
2*x-10/7 = 0 // + 10/7
2*x = 10/7 // : 2
x = 10/7/2
x = 5/7
x = 5/7
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