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0.5x-0.7(800+x)=750
We move all terms to the left:
0.5x-0.7(800+x)-(750)=0
We add all the numbers together, and all the variables
0.5x-0.7(x+800)-750=0
We multiply parentheses
0.5x-0.7x-560-750=0
We add all the numbers together, and all the variables
-0.2x-1310=0
We move all terms containing x to the left, all other terms to the right
-0.2x=1310
x=1310/-0.2
x=-6550
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