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40+20x=9x-13*4
We move all terms to the left:
40+20x-(9x-13*4)=0
We add all the numbers together, and all the variables
20x-(9x-52)+40=0
We get rid of parentheses
20x-9x+52+40=0
We add all the numbers together, and all the variables
11x+92=0
We move all terms containing x to the left, all other terms to the right
11x=-92
x=-92/11
x=-8+4/11
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