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10-((5/7)*x) = 30 // - 30
10-((5/7)*x)-30 = 0
(-5/7)*x-30+10 = 0
-5/7*x-20 = 0 // + 20
-5/7*x = 20 // : -5/7
x = 20/(-5/7)
x = -28
x = -28
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