20 - 3x = 2
Solving for x:
20 - 3x = 2
the 20 that is on the left side of the equality, we pass it to the righ side with minus sign:
-3x = 2 - 20
The -3 which is multiplying x on the left side, we pass it to the right side dividing:
x = (2 - 20)/(-3)
Doing the operations:
x = (-18)/(-3) = 6
x = 6