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(1/7)*x-(7*x)+7 = 145/7 // - 145/7
(1/7)*x-(7*x)-(145/7)+7 = 0
(1/7)*x-7*x-145/7+7 = 0
-48/7*x-96/7 = 0 // + 96/7
-48/7*x = 96/7 // : -48/7
x = 96/7/(-48/7)
x = -2
x = -2
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