3x+40=7x+50

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Solution for 3x+40=7x+50 equation: 



3x+40=7x+50

We move all terms to the left:

3x+40-(7x+50)=0

We get rid of parentheses

3x-7x-50+40=0

We add all the numbers together, and all the variables

-4x-10=0

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

-4x=10

x=10/-4

x=-2+1/2

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