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0.7(x+)=3150
We move all terms to the left:
0.7(x+)-(3150)=0
We add all the numbers together, and all the variables
0.7(+x)-3150=0
We multiply parentheses
0.7x-3150=0
We move all terms containing x to the left, all other terms to the right
0.7x=3150
x=3150/0.7
x=4500
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