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20-x = (3/4)*x-(11/4) // - (3/4)*x-(11/4)
11/4-x-((3/4)*x)+20 = 0
(-3/4)*x-x+11/4+20 = 0
91/4-7/4*x = 0 // - 91/4
-7/4*x = -91/4 // : -7/4
x = -91/4/(-7/4)
x = 13
x = 13
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