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3x+25=4x-19=90
We move all terms to the left:
3x+25-(4x-19)=0
We get rid of parentheses
3x-4x+19+25=0
We add all the numbers together, and all the variables
-1x+44=0
We move all terms containing x to the left, all other terms to the right
-x=-44
x=-44/-1
x=+44
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