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6x-9=2x-19=90
We move all terms to the left:
6x-9-(2x-19)=0
We get rid of parentheses
6x-2x+19-9=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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