5а+2а=35

To solve the equation \( 5a + 2a = 35 \), you can combine the like terms on the left side:

\[ (5a + 2a) = 35 \]

This simplifies to:

\[ 7a = 35 \]

Next, divide both sides by 7 to isolate \( a \):

\[ a = \frac{35}{7} \]

So,

\[ a = 5 \]

The solution is \( a = 5 \).