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-13x-98=91-4x
We move all terms to the left:
-13x-98-(91-4x)=0
We add all the numbers together, and all the variables
-13x-(-4x+91)-98=0
We get rid of parentheses
-13x+4x-91-98=0
We add all the numbers together, and all the variables
-9x-189=0
We move all terms containing x to the left, all other terms to the right
-9x=189
x=189/-9
x=-21
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