Question

What is the answer i really need help 2x-7+-9x+81

Answer 1

Your expression seems a little incomplete. It seems you mean to ask

$2x-7+\left(-9x\right)+81=0$

So, I am solving the question based on this, which anyways will solve your query.

Answer:

Please check the explanation.

Step-by-step explanation:

Given the expression

$2x-7+\left(-9x\right)+81=0$

$\mathrm{Remove\:parentheses}:\quad \left(-a\right)=-a$

$2x-7-9x+81=0$

$\mathrm{Group\:like\:terms}$

$2x-9x-7+81=0$

$\mathrm{Add\:similar\:elements:}\:2x-9x=-7x$

$-7x-7+81=0$

$\mathrm{Add/Subtract\:the\:numbers:}\:-7+81=74$

$-7x+74=0$

$\mathrm{Subtract\:}74\mathrm{\:from\:both\:sides}$

$-7x+74-74=0-74$

$-7x=-74$

$\mathrm{Divide\:both\:sides\:by\:}-7$

$\frac{-7x}{-7}=\frac{-74}{-7}$

$x=\frac{74}{7}$

Therefore, the answer is:

• $x=\frac{74}{7}$