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Blizzard [7]
3 years ago
5

Please help me with number 7

Mathematics
1 answer:
Wittaler [7]3 years ago
4 0

"twelve decreased by twice a number"   --->   12 - 2x

"8 times the sum of number and 4"   --->   8(x + 4)

12 - 2x  =  8(x + 4)

12 - 2x  =  8x + 32                    (distributive property)

12        =  10x + 32                   (add 2x to both sides)

-20       =  10x                           (subtract 32 from both sides)

x  =  -2                                      (divide both sides by 10)

That's answer.
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Explanation

1. collect the like terms

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2. Move constant to the right-hand side and change its sign .

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