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18-((11/4)*x) = 7 // - 7
18-((11/4)*x)-7 = 0
(-11/4)*x-7+18 = 0
11-11/4*x = 0 // - 11
-11/4*x = -11 // : -11/4
x = -11/(-11/4)
x = 4
x = 4
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