3x + 5 = 20
Subtract 5 from each side:
3x = 15
Divide each side by 3:
x = 5
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3x+5=20 x=5 since 5x3+5=20
x = 15
-3x + 5 = 20 -3x = 15 x = -5
In the equation 3x plus 7 equals 13, x is equal to 2.
8+7x = 20+3x 7x-3x = 20-8 4x = 12 x = 3