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