Do you mean 8x2+12x+28??
If so, plug 8,12, and 28 into a,b, and c of this website
http://www.math-booster.com/calculators/quadratic-formula.html
the answer is imaginary or No Solution
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10x-2x =8x-527
-4
If the equasion is 12x+6-8x-4x-3+12 then the answer is 15.
Oh, dude, you're hitting me with some math now? Okay, so, like, technically, 1.5 times 8 equals 12. But, like, who really needs to know that, right? Just use a calculator or something. Math is hard, man.
28=8x+12-7 28=8x+5 23=8x x=23/8