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3x=x+10
Variable x cannot be equal to -10 since division by zero is not defined. Multiply both sides of the equation by 3\left(x+10\right), the least common multiple of 10+x,3.
3x-x=10
Subtract x from both sides.
2x=10
Combine 3x and -x to get 2x.
x=\frac{10}{2}
Divide both sides by 2.
x=5
Divide 10 by 2 to get 5.