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4(x+9)-13x=36
We move all terms to the left:
4(x+9)-13x-(36)=0
We add all the numbers together, and all the variables
-13x+4(x+9)-36=0
We multiply parentheses
-13x+4x+36-36=0
We add all the numbers together, and all the variables
-9x=0
x=0/-9
x=0
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