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= 2x + 2x + 2x + x + 4 + 3
= 7x + 7
2) 2x + x + 1 + 2x - 2x - 3
= 2x + 2x - 2x + x + 1 - 3
= 3x - 2
3) 2x + 2x + 1 + (-2x - 2x - 3)
= 2x + 2x + 1 - 2x - 2x - 3
= 2x + 2x - 2x - 2x + 1 - 3
= 0 - 2
= -2