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\frac{15}{3}+x+\frac{5}{3}=7
Convert 5 to fraction \frac{15}{3}.
\frac{15+5}{3}+x=7
Since \frac{15}{3} and \frac{5}{3} have the same denominator, add them by adding their numerators.
\frac{20}{3}+x=7
Add 15 and 5 to get 20.
x=7-\frac{20}{3}
Subtract \frac{20}{3} from both sides.
x=\frac{21}{3}-\frac{20}{3}
Convert 7 to fraction \frac{21}{3}.
x=\frac{21-20}{3}
Since \frac{21}{3} and \frac{20}{3} have the same denominator, subtract them by subtracting their numerators.
x=\frac{1}{3}
Subtract 20 from 21 to get 1.