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5x+3x=5x+15/2 what value 3x make the equation true

5x+3x=5x+15/2 what value 3x make the equation true
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5 votes
5x+3x=5x+15/2 what value 3x make the equation true

User Aiko
by
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2 Answers

3 votes
we need to get the 3x alone so
5X+3X=5X+15÷2
(÷5x)3X=5X+7.5(÷5X)
(÷3)X=7.5(÷3)
X=7.5÷3
X=2.s
User Jonas Masalskis
by
8.7k points
5 votes
Subtract 5x from both sides. You'll get 3x=15/2
Turn 15/2 into a mixed number. 7 1/2
Divide 3 both sides.
Answer: 2 1/2

Check your work.

5*2 1/2 =12.5 3*2 1/2= 7.5
Therefore 12.5+7.5=12.5+7.5
12.5+7.5=20
Therefore the answer is 2.5 or 2 1/2
User TomW
by
8.5k points
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