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(7x+40)+(5x+4)+(4x+9)+(9x-6)+(4x+1)=900
We move all terms to the left:
(7x+40)+(5x+4)+(4x+9)+(9x-6)+(4x+1)-(900)=0
We get rid of parentheses
7x+5x+4x+9x+4x+40+4+9-6+1-900=0
We add all the numbers together, and all the variables
29x-852=0
We move all terms containing x to the left, all other terms to the right
29x=852
x=852/29
x=29+11/29
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