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(1/7)*x-5 = -45/7 // + -45/7
(1/7)*x-(-45/7)-5 = 0
(1/7)*x+45/7-5 = 0
1/7*x+10/7 = 0 // - 10/7
1/7*x = -10/7 // : 1/7
x = -10/7/1/7
x = -10
x = -10
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