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70x+70x(0.07)=300
We move all terms to the left:
70x+70x(0.07)-(300)=0
We multiply parentheses
70x+4.9x-300=0
We add all the numbers together, and all the variables
74.9x-300=0
We move all terms containing x to the left, all other terms to the right
74.9x=300
x=300/74.9
x=4+0.39999999999998/74.9
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