7. 16: 3/8*x+1=5, 3/8*x=6, x=16
8. -32: 7-1/4*x=15, -1/4*x=8, x=-32
Answer is D, 2(4a + 7.)
A is equivalent to 4a + 24.
B is equivalent to 16a + 40.
C is equivalent to 8a + 32.
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To solve this question, we need to get x by itself. We can do that by subtracting 3.6 from each side. But, adding a negative is the same thing as subtracting a positive number. That means that you could also add -3.6 to both sides.