4x+3+(-3x) +7x-6x

To simplify the expression, combine like terms:

4x + 3 + (-3x) + 7x - 6x

Combine the x terms together and the constants together:

(4x - 3x + 7x - 6x) + 3

Combine like terms:

(2x) + 3

The simplified expression is 2x + 3.