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\left(x+2\right)\times 10-0\times 5x\left(x+2\right)=x\times 12
Variable x cannot be equal to any of the values -2,0 since division by zero is not defined. Multiply both sides of the equation by x\left(x+2\right), the least common multiple of x,x+2.
10x+20-0\times 5x\left(x+2\right)=x\times 12
Use the distributive property to multiply x+2 by 10.
10x+20-0x\left(x+2\right)=x\times 12
Multiply 0 and 5 to get 0.
10x+20-0=x\times 12
Anything times zero gives zero.
10x+20-0-x\times 12=0
Subtract x\times 12 from both sides.
10x+20-12x=0
Reorder the terms.
-2x+20=0
Combine 10x and -12x to get -2x.
-2x=-20
Subtract 20 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-20}{-2}
Divide both sides by -2.
x=10
Divide -20 by -2 to get 10.