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0.8x-0.4(80+x)=-0.25(80)
We move all terms to the left:
0.8x-0.4(80+x)-(-0.25(80))=0
We add all the numbers together, and all the variables
0.8x-0.4(x+80)-(-0.258)=0
We add all the numbers together, and all the variables
0.8x-0.4(x+80)+0.258=0
We multiply parentheses
0.8x-0.4x-32+0.258=0
We add all the numbers together, and all the variables
0.4x-31.742=0
We move all terms containing x to the left, all other terms to the right
0.4x=31.742
x=31.742/0.4
x=79+0.142/0.4
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