2a - a = a
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y=mx+b A=xy; A=(pi)r^2; V=xyh; (-b= or - (b^2-4ac)^1/2)/2a ( actually read as negative b plus or minus the square root of b squared minus four ac, all divided by 2a....quadratic formula) This should get you, if you need more or this is not what you were looking for, let me know.
4a
2a - 5a = -3a
9a +8 -2a -3 -5a = 2a +5
2a x 3b = 6ab