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2*x-(7*x)-5/7 = -145/7 // + -145/7
2*x-(7*x)-5/7-(-145/7) = 0
2*x-7*x-5/7+145/7 = 0
20-5*x = 0 // - 20
-5*x = -20 // : -5
x = -20/(-5)
x = 4
x = 4
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