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6-x+6(1-x)+6(2-x)+6(3-x)=259
We move all terms to the left:
6-x+6(1-x)+6(2-x)+6(3-x)-(259)=0
We add all the numbers together, and all the variables
-x+6(-1x+1)+6(-1x+2)+6(-1x+3)+6-259=0
We add all the numbers together, and all the variables
-1x+6(-1x+1)+6(-1x+2)+6(-1x+3)-253=0
We multiply parentheses
-1x-6x-6x-6x+6+12+18-253=0
We add all the numbers together, and all the variables
-19x-217=0
We move all terms containing x to the left, all other terms to the right
-19x=217
x=217/-19
x=-11+8/19
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