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2\left(5x+10\right)=9x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 4x, the least common multiple of 2x,4.
10x+20=9x
Use the distributive property to multiply 2 by 5x+10.
10x+20-9x=0
Subtract 9x from both sides.
x+20=0
Combine 10x and -9x to get x.
x=-20
Subtract 20 from both sides. Anything subtracted from zero gives its negation.