3x+7x=75

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Solution for 3x+7x=75 equation: 



3x+7x=75

We move all terms to the left:

3x+7x-(75)=0

We add all the numbers together, and all the variables

10x-75=0

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

10x=75

x=75/10

x=7+1/2

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