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