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1-((3/7)*x)-(7*x) = 527/7 // - 527/7
1-((3/7)*x)-(7*x)-(527/7) = 0
(-3/7)*x-7*x-527/7+1 = 0
-52/7*x-520/7 = 0 // + 520/7
-52/7*x = 520/7 // : -52/7
x = 520/7/(-52/7)
x = -10
x = -10
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