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3 = (3/4)*x-18 // - (3/4)*x-18
3-((3/4)*x)+18 = 0
(-3/4)*x+3+18 = 0
21-3/4*x = 0 // - 21
-3/4*x = -21 // : -3/4
x = -21/(-3/4)
x = 28
x = 28
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