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7(e-9)+3(e-6)=-51
We move all terms to the left:
7(e-9)+3(e-6)-(-51)=0
We add all the numbers together, and all the variables
7(e-9)+3(e-6)+51=0
We multiply parentheses
7e+3e-63-18+51=0
We add all the numbers together, and all the variables
10e-30=0
We move all terms containing e to the left, all other terms to the right
10e=30
e=30/10
e=3
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