\(A+B=\left(2x^2y+3xy-2\right)+\left(2xy-3x^2y+5x-3\right)\)
\(A+B=2x^2y+3xy-2+2xy-3x^2y+5x-3\)
\(A+B=\left(2x^2y-3x^2y\right)+\left(3xy+2xy\right)+\left(-2-3\right)+5x\)
\(A+B=-x^2y+5xy-5+5x\)
\(A-B=\left(2x^2y+3xy-2\right)-\left(2xy-3x^2y+5x-3\right)\)
\(A-B=2x^2y+3xy-2-2xy+3x^2y-5x+3\)
\(A-B=\left(2x^2y+3x^2y\right)+\left(3xy-2xy\right)+\left(-2+3\right)-5x\)
\(A-B=5x^2y+xy+1-5x\)