9xy2 * 9x5y2 = 81x6y4
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9x23
It is equal to -18x^2 +9x
9x
Honey, that's not a linear equation, so there's no slope-intercept form to be found here. You've got a monomial mess on your hands with 9xy. If you want to simplify it, just leave it as 9xy. No need to force it into a form it doesn't belong in.
5.4 = (9x+4)/5 - 813.4 = (9x+4)/567 = 9x+463 = 9x7 = xYour answer is 7.