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0.4(x-150)=280
We move all terms to the left:
0.4(x-150)-(280)=0
We multiply parentheses
0.4x-60-280=0
We add all the numbers together, and all the variables
0.4x-340=0
We move all terms containing x to the left, all other terms to the right
0.4x=340
x=340/0.4
x=850
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