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1-(7*x) = 4*x-54 // - 4*x-54
1-(7*x)-(4*x)+54 = 0
1-7*x-4*x+54 = 0
55-11*x = 0 // - 55
-11*x = -55 // : -11
x = -55/(-11)
x = 5
x = 5
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