The sum of x and twice y is equal to m.
Twice y means we multiply y by 2:
2y
The sum of x and twice y:
x + 2y
The phrase is equal to means an equation, so we set x + 2y equal to m
x + 2y = m
Twice y means we multiply y by 2:
2y
The sum of x and twice y:
x + 2y
The phrase is equal to means an equation, so we set x + 2y equal to m
x + 2y = m