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a) 6*2-4*2+x2=0
12-8+2x=0
4+2x=0
2x=-4
x=(-4)/2
x=-2
b) -3x+8x-15x
(-3x-15x)+8x
-18x+8x
-10x
c) -x4-2x3+5x3
-4x-6x+15x
5x