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-1800=-4x+6(7000)
We move all terms to the left:
-1800-(-4x+6(7000))=0
We get rid of parentheses
4x-67000-1800=0
We add all the numbers together, and all the variables
4x-68800=0
We move all terms containing x to the left, all other terms to the right
4x=68800
x=68800/4
x=17200
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