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(4x+5)(2x+3)=8x^2+22+15
We move all terms to the left:
(4x+5)(2x+3)-(8x^2+22+15)=0
We get rid of parentheses
-8x^2+(4x+5)(2x+3)-22-15=0
We multiply parentheses ..
-8x^2+(+8x^2+12x+10x+15)-22-15=0
We add all the numbers together, and all the variables
-8x^2+(+8x^2+12x+10x+15)-37=0
We get rid of parentheses
-8x^2+8x^2+12x+10x+15-37=0
We add all the numbers together, and all the variables
22x-22=0
We move all terms containing x to the left, all other terms to the right
22x=22
x=22/22
x=1
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