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(135)+(3x+31)+(4x+15)+(6x-8)+(120)+(7x-64)+(5x-4)=900
We move all terms to the left:
(135)+(3x+31)+(4x+15)+(6x-8)+(120)+(7x-64)+(5x-4)-(900)=0
We add all the numbers together, and all the variables
(3x+31)+(4x+15)+(6x-8)+(7x-64)+(5x-4)-645=0
We get rid of parentheses
3x+4x+6x+7x+5x+31+15-8-64-4-645=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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