Solve for x
x=20
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x+20=2x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 2x.
x+20-2x=0
Subtract 2x from both sides.
-x+20=0
Combine x and -2x to get -x.
-x=-20
Subtract 20 from both sides. Anything subtracted from zero gives its negation.
x=20
Multiply both sides by -1.
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