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3-84.

Add two to both sides.

−2 + x = −x + 2
+2 +2

Get the variable on one side.

x = −x + 4
+x +x

2x = 4

x = 2

How does the negative sign in front of the variable change what is inside?

Follow the steps in part (a).

Follow the steps in part (a).

x = all numbers

Follow the steps in part (b).