One-Step
3x = 33
x = 11
5(x + 3)
5x + 15
2x + 5 = 21
x = 8
5(x + 14) = 100
x = 6
Expression
has numbers and/or variables but NO equal sign
12x = 144
x = 12
7( x + 9)
7x + 63
3x + 8 = 20
x = 4
2(13x + 3) = 58
x = 2
Equation
Has an equal sign
x/5 = 8
x = 40
4( 2x + 7)
8x + 28
x/3 + 26 = 29
x = 9
x+4(x + 11) = 56
x = 2
Coefficient
the number in front of the variable
x - 11 = 44
x = 55
9( 2 - x)
18 - 9x
x/4 - 5 = 3
x = 32
4x + 2 (x + 6) = 78
x = 11
Constant
Number
x + 100 = 123
x = 23
6(x - 9)
6x - 54
5x - 1 = 19
x = 4
4x + 2( x + 12) = 72
x = 8
Variable
represents a number
also accepting the letter in the equation (x or y)