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little diffrent
Bring the 2x to the other side by substracting it 4x - 2x - 21 = -3 Bring -21 to the other side by adding it 4x - 2x = +21 - 3 Simplify 2x = 18 x = 9
2x = +18 x = 9

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Other answers:

keep bringing it down
is this absolute value? what is does the [ ] mean?
I think she means ( )
in math we seldom bring things. we usually add, subtract, multiply or divide. sometimes we bring apples to our teachers
steps are : add 21 to both sides subtract 2x from both sides divide by 2

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