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900=6(x)+2(200-x)
We move all terms to the left:
900-(6(x)+2(200-x))=0
We add all the numbers together, and all the variables
-(6x+2(-1x+200))+900=0
We calculate terms in parentheses: -(6x+2(-1x+200)), so:We get rid of parentheses
6x+2(-1x+200)
We multiply parentheses
6x-2x+400
We add all the numbers together, and all the variables
4x+400
Back to the equation:
-(4x+400)
-4x-400+900=0
We add all the numbers together, and all the variables
-4x+500=0
We move all terms containing x to the left, all other terms to the right
-4x=-500
x=-500/-4
x=+125
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