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