Question

If 5x+15=30 then x=3

Answer 1

Subtract 15 from both sides

$5x=30-15$

Simplify 30-15 to 15

$5x=15$

Divide both sides by 5

$x=15/5$

Simplify 

$x = 3 .$

This is a true statement. 

Answer 2

That would be a true statement.