This is always true! According to the Additive Inverse Axiom -X+X always equals 0 which is equivalent to 0X.
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x+(-2.5)+6.8=0x+(-2.5+6.8)=0x+(4.3)=0x+4.3=0Subtract 4.3 from both sides and you get:x= -4.3
x2-14x+45=0(x-9)(x-5)=0x-9=0 & x-5=0x=9 & x=5
x2 = 8xx2- 8x = 0x(x - 8) = 0x = 0 ;x - 8 = 0x = 8
X2+0X - 2.25=01.= Both sides by 2.25X2+0X=2.252. Subtract both sides by 0XX2=2.253. Square root both sidesX=1.5
12x^3+17x^2+5x=0x(12x^2+17x+5)=0x(x+1)(12x+5)=0x=0x=-1x=-5/12