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If a - 8 equals four plus 3 times a, what is the value of -2a?

12

Step-by-step explanation:

Let's write this into a equation:

a - 8 equals is:

four plus 3 times a is:

Combining it together we get:

If we subtract 3a from both sides we get:

Now we add 8 to both sides to get:

Normally, we would divide both sides by -2 to solve for a, but the question wants us to get the value of -2a, which is 12.

step-by-step explanation:

you divide the denominator by the numerator on both sides and if the quotients are equal then the fractions are equivalent