21.28
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12
The two numbers that can multiply to get -48 and add to get 8 are 12 and -4. When multiplied, 12 × -4 equals -48, and when added, 12 + (-4) equals 8.
n/8=2.4 multiply both by 8 n=19.2
Multiply the first equation by -3
Multiply the first by 8 and the second by 3