you use the quadratic formula: x= -b plus/minus the square root of b^2 - 4ac all over 2a.
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There's nothing to solve, it's simply an expression.
5x=30...then x=30/5. So X=6.
100*5/30 = 500/30 = 50/3 = 16.66... %
30% of 60 = 0.3 x 60 = 18
-35