3x+140=7x=90

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Solution for 3x+140=7x=90 equation: 



3x+140=7x=90

We move all terms to the left:

3x+140-(7x)=0

We add all the numbers together, and all the variables

-4x+140=0

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

-4x=-140

x=-140/-4

x=+35

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