Question

Show your work
20.5=15.5+(-3.6x)+1.8x
A. -20
B. -2.7
C. 6.6
D. 20

Answer 1

Starting with the given 20.5=15.5+(-3.6x)+1.8x, rewrite "+(-3.6x)" as "-3.6x:"

20.5=15.5-3.6x+1.8x

Next, combine like terms: 20.5-15.5 = -3.6x+1.8x, or

5 = -1.8x

Dividing both sides by -1.8 yields -2.78 = x, or x = -7/9

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