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\frac{2x}{5}=\frac{3x}{\left(2+6\right)\times 5}
Add 3 and 2 to get 5.
\frac{2x}{5}=\frac{3x}{8\times 5}
Add 2 and 6 to get 8.
\frac{2x}{5}=\frac{3x}{40}
Multiply 8 and 5 to get 40.
\frac{2x}{5}-\frac{3x}{40}=0
Subtract \frac{3x}{40} from both sides.
\frac{8\times 2x}{40}-\frac{3x}{40}=0
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 5 and 40 is 40. Multiply \frac{2x}{5} times \frac{8}{8}.
\frac{8\times 2x-3x}{40}=0
Since \frac{8\times 2x}{40} and \frac{3x}{40} have the same denominator, subtract them by subtracting their numerators.
\frac{16x-3x}{40}=0
Do the multiplications in 8\times 2x-3x.
\frac{13x}{40}=0
Combine like terms in 16x-3x.
13x=0
Multiply both sides by 40. Anything times zero gives zero.
x=0
Product of two numbers is equal to 0 if at least one of them is 0. Since 13 is not equal to 0, x must be equal to 0.