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-2x+6x-8x=9-7+8
-4x=10
x=10/-4
x=-2,5
2x-(-3+9-1)+2=x-(-3)
2x-5+2=x+3
2x-x=3+5-2
x=6
5x-(-3)+(-9)=4x-(-7+1)
5x+3-9=4x+6
5x-4x=6-3+9
x=12