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xx+5x\times 3=5\times 2+x\left(x+1\right)
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 5x, the least common multiple of 5,x.
x^{2}+5x\times 3=5\times 2+x\left(x+1\right)
Multiply x and x to get x^{2}.
x^{2}+15x=5\times 2+x\left(x+1\right)
Multiply 5 and 3 to get 15.
x^{2}+15x=10+x\left(x+1\right)
Multiply 5 and 2 to get 10.
x^{2}+15x=10+x^{2}+x
Use the distributive property to multiply x by x+1.
x^{2}+15x-x^{2}=10+x
Subtract x^{2} from both sides.
15x=10+x
Combine x^{2} and -x^{2} to get 0.
15x-x=10
Subtract x from both sides.
14x=10
Combine 15x and -x to get 14x.
x=\frac{10}{14}
Divide both sides by 14.
x=\frac{5}{7}
Reduce the fraction \frac{10}{14} to lowest terms by extracting and canceling out 2.