2x^2+10x-3x-15-(15-6x-5x+2x^2)=-30
2x^2+10x-3x-15-(15-11x+2x^2)=-30
2x^2+10x-3x-15-15+11x-2x^2=-30
18x-30=-30
18x=0
x=0
2x^2+10x-3x-15-(15-6x-5x+2x^2)=-30
2x^2+10x-3x-15-(15-11x+2x^2)=-30
2x^2+10x-3x-15-15+11x-2x^2=-30
18x-30=-30
18x=0
x=0