4n - 10 = 38 (add 10 to both sides)
4n = 48 (divide by 4 to both sides)
n = 12
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48-n=4n-7
As the subtraction is done first, it needs to be in brackets; thus eighteen decreased by four then times three is: (18 - 4) × 3
n (number) minus four ----->n-4
4xy - 2xy
3/2 4* 9/4 = 9