Question 349322
You need consoling:
  Being bad at math is like being a bad driver.
You're just not doing what the other drivers do
that make them good drivers. The teacher is mad 
because you keep driving her car off a cliff.
  All I can say is math never strays far from the 
basics, and if you missed the basics somehow,
you have to back there- like back to parallel
parking. Don't worry if you're too young to drive-
I'm just using examples. 
  You're not born to be bad at math- you just got that
way
{{{-7(3+2x) = 84}}}
You MUST do the same thing to both sides of an equation
Divide both sides by {{{-7}}}
{{{((-7)/(-7))*(3 + 2x) = 84/(-7)}}} 
{{{3 + 2x = -12}}}
Now subtract {{{3}}} from both sides
{{{3 - 3 + 2x = -12 - 3}}}
{{{2x = -15}}}
Divide both sides by {{{2}}}
{{{x = -7.5}}}
Keep at it.