2x become x2
3x1/2 becomes 2x3/2
1 becomes x
sub 9 into values for x = (81 - 54 +9) which equals 36
sub 4 into values for x = (16 - 16 + 4) which equals 4
now take away the value when you sub in 4 from when you sub in 9
= 36-4= 32
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