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5x²-10x-5x²+2x=-4
-8x=-4
x=2
x(x-2)-(x+1)*(x+3)=1+2x
x²-2x-x²-3x-x-x=1+2x
-7x=1+2x
-9x=1
x=-¹/₉
(y-1)*y-y²=2
y²-y-y²=2
-y=2
y=-2
2x/3+5x/2=19 /*6
4x+15x=19
19x=19
x=1