3.5x+3x+7+2x=75

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Solution for 3.5x+3x+7+2x=75 equation: 



3.5x+3x+7+2x=75

We move all terms to the left:

3.5x+3x+7+2x-(75)=0

We add all the numbers together, and all the variables

8.5x-68=0

We move all terms containing x to the left, all other terms to the right

8.5x=68

x=68/8.5

x=8

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