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4x2-16=2x+1
4x2+2x=-15
2x+2x=-15
4x=-15
x=-3.75
2xkw-2xkw=xkw+3x-2x-6
2xkw-2xkw-xkw-3x+2x=-6
-xkw-x=-6|+xkw
-x=-6 |:-
x=6