add

1 + 9
x+7 5x

this does not make sense to me

To simplify the expression "1 + 9x + 7 + 5x," we combine like terms.

Combining the coefficients of the terms 9x and 5x gives us:
9x + 5x = 14x

Combining the constants 1 and 7 gives us:
1 + 7 = 8

Therefore, the simplified expression is:
8 + 14x