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80+60(-x+420)=31000
We move all terms to the left:
80+60(-x+420)-(31000)=0
We add all the numbers together, and all the variables
60(-1x+420)+80-31000=0
We add all the numbers together, and all the variables
60(-1x+420)-30920=0
We multiply parentheses
-60x+25200-30920=0
We add all the numbers together, and all the variables
-60x-5720=0
We move all terms containing x to the left, all other terms to the right
-60x=5720
x=5720/-60
x=-95+1/3
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