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(-1/7)*x+(4/7)*x-7 = -52/7 // + -52/7
(-1/7)*x+(4/7)*x-(-52/7)-7 = 0
(-1/7)*x+(4/7)*x+52/7-7 = 0
3/7*x+3/7 = 0 // - 3/7
3/7*x = -3/7 // : 3/7
x = -3/7/3/7
x = -1
x = -1
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