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5.28 = (5*x)/90 // - (5*x)/90
5.28-((5*x)/90) = 0
(-1/18)*x+5.28 = 0
5.28-1/18*x = 0 // - 5.28
-1/18*x = -5.28 // : -1/18
x = -5.28/(-1/18)
x = 95.0399924
x = 95.0399924
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