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3 years ago

What is 7(2a-3)-5a=-3

Mathematics

2 answers:

Elan Coil [88]3 years ago

4 0

7(2a-3)-5a=-3

distribute

14a -21 -5a = -3

combine like terms

9a -21 = -3

add 21 to each side

9a = 18

divide by 9

a =2

Mariulka [41]3 years ago

4 0

Hi there!

Your equation states 7(2a - 3) - 5a = -3

The first step is to simplify the parentheses. When they are touching a number like that, or in your case number 7, it means multiplication.

7(2a - 3)

Start multiplying

7 × 2a = 14a.

7 × (-3) = -21

Now combine the answers and then the equation.

14a - 21 - 5a = -3

Add 21 to both sides

14a - 21 - 5a = -3

+ 21 +21

You will be left with 14a - 5a = 18

Subtract 14a - 5a

That will equal 9a

9a = 18

Divide 9 from both sides.

9 ÷ 9, you will be left with a.

9 ÷ 18 would equal 2.

Your answer would be a = 2

Hope this helped!~

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