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literally, make an equation:
20.6 + 2.1x = -8.2x
left has two terms. you want to simplify the terms given in the equation.
Move -8.2x to left, (change sign of the term) or:
20.6 + 2.1x -2.1x = -8.2x -2.1x
20.6 = -10.3x
both sides need to be divided by -10.3 to solve for x:
20.6/(-10.3) = -10.3x /(-10.3)
-2 = x
You solved for x : x= -2
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