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Does the variable have to stand for something when we write an expression/equation? explain

simplify the following expression

3x +5x

3x +5x

A

8x2

B

8+2x

C

8

D

8x

simplify the following expression

7(10c)

7(10c)

A

17c

B

7+10c

C

70c

D

-3c

simplify the following expression

1/2(2x+2)

1/2(2x+2)

A

x+1

B

2 1/2 +2x

C

x+2