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9^(x)+3^(1+2x)=50
We move all terms to the left:
9^(x)+3^(1+2x)-(50)=0
We add all the numbers together, and all the variables
9^x+3^(2x+1)-50=0
We move all terms containing x to the left, all other terms to the right
9^x+3^(2x+1)=50
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