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(1/7)*x-2 = -55/28 // + -55/28
(1/7)*x-(-55/28)-2 = 0
(1/7)*x+55/28-2 = 0
1/7*x-1/28 = 0 // + 1/28
1/7*x = 1/28 // : 1/7
x = 1/28/1/7
x = 1/4
x = 1/4
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