# 7th math

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Simply the expression.
-1 - (-3x + 2) - 7x + 8

• 7th math -

-1 - (-3x + 2) - 7x + 8

-1 -2 + 8 + 3x - 7x

5 - 4x

• 7th math -

what is 2 digit number which is 9 times the sums of its digit?

• 7th math -

Mary earns \$8 per hour.Write an algebraic expression to evaluate how much money Mary will earn if she works for 15,20,25,or 30 hours.

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