Question 123797
{{{-9 + 20 = 19x - 4 - 18x}}}
The biggest thing to know about an equation
is this: "Anything you do to one side, you must do to the other side."
I'm going to add {{{4}}} to both sides.
Another way to look at it is I'm adding this equation: {{{4 = 4}}}
to the one I've got
{{{-9 + 20 + 4 = 19x + 4 - 4 - 18x}}}
On the right side I have {{{4 - 4}}} which equals {{{0}}}
{{{- 9 + 24 = 19x - 18x}}}
Do the operation on the left
{{{15 = 19x - 18x}}}
Do the operation on the right
{{{15 = x}}} answer