Sum means add
(x+5) + (-4x-2) + (2x-1)
=-3x+3+(2x-1)
=-x+2
The answer is 4.25
In the first step he never distributed the 1/12 to the 18. He only distributed to the 14
Since the exponents is positive, move the decimal 7 places to the right, thus giving you 12090000
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