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Jaida Hartman
Mathematics
9 July, 16:36
Solve the equation
3 (-a-3) - 2 (3a+3) = -78
+4
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2
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Stephen Snow
9 July, 16:40
0
Given equation is 3 (-a-3) - 2 (3a+3) = -78
we can start by distributing numbers which are outside parenthesis
3 (-a-3) - 2 (3a+3) = -78
-3a-9-6a-6=-78
combine like terms
-9a-15=-78
-9a=-78+15
-9a=-63
a=-63/-9
a=7
Hence final answer is a=7.
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Laurel Krueger
9 July, 16:46
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We are given this equation:
3 (-a-3) - 2 (3a+3) = -78
We will use distributive property here:
a (b+c) = a*b + a*c
-3a-9 - 6a-6=-78
combining like terms
-9a - 15 = -78
we add 15 to both sides
-9a - 15 + 15 = - 78+15
-9a = -63
dividing both sides by - 9
a=7
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