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900=135+5x-4+3x+31+7x-64+4x+15+6x-8+120
We move all terms to the left:
900-(135+5x-4+3x+31+7x-64+4x+15+6x-8+120)=0
We add all the numbers together, and all the variables
-(25x+225)+900=0
We get rid of parentheses
-25x-225+900=0
We add all the numbers together, and all the variables
-25x+675=0
We move all terms containing x to the left, all other terms to the right
-25x=-675
x=-675/-25
x=+27
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