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MaRussiya [10]
2 years ago
12

What is the value of 12(3x+5x) when x=7

Mathematics
2 answers:
Nadusha1986 [10]2 years ago
6 0
1,128. I'm glad you asked for my help!!!!!!!!
Anna35 [415]2 years ago
5 0
Subsitute 7 for x

12(3(7)+5(7))
12(21+35)
12(56)
672
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7x + 6(-3 + 4x) = 199<br>what does x equal?
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Simplify. Note the equal sign. What you do to one side, you do to the other. Follow PEMDAS.

Isolate the x.

First, distribute 6 to all terms within the parenthesis

6(-3) = -18

6(4x) = 24x

7x - 18 + 24x = 199

Simplify. Combine like terms

31x - 18 = 199

Isolate the x. Add 18 to both sides

31x - 18 (+18) = 199 (+18)

31x = 199 + 18

31x = 217

Isolate the x. Divide 31 from both sides

31x/31 = 217/31

x = 217/31

x = 7

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