To rotate a point around the origin by 180 degrees, multiply both parts of the coordinate point by 
. (This means you go from 
to 
.)
Distribute 2 and remove parentheses :
1/2x+8=3x-6
Multiply both sides of equation by 2:
x+16=6x-12
Move terms:
x+16-6x=-12
x-6x=-12-16
Collect like terms:
-5x=-28
Divide both sides:
x=28/5
If i were you, i would add one to 7x and fifteen. this gives you x^2+8x+16, a perfect square of x+4.
Five thousand four hundred and eighty-seven
