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-2*(-1)+2+(2*(-1)*2)=2+2-4=0
2.
a) -2x -2=4
-2x=6 /:(-2)
x=-3
b)x+6x+4=2x-1
7x-2x=-1+4
5x=3 /:5
x=3/5
c)
3
a) P=πr² /:π
2
a: x=-3
b: x=-1
c: x=12
3: P=pi*r^3