2x+6=20
move 7 to the right side.
The sign changes from positive to negative. whenever moving a number to the other side the sign changes.
2x+6-6=20-6
2x= 14
Divide by 2 for both of the numbers
x=7
check answer:
Substitute x into the equation
2(7)+6=20
20= 20
Answer: x=7
