Solve for x
x=20
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50=28+30-x+12
Combine -x and x to get 0.
50=58-x+12
Add 28 and 30 to get 58.
50=70-x
Add 58 and 12 to get 70.
70-x=50
Swap sides so that all variable terms are on the left hand side.
-x=50-70
Subtract 70 from both sides.
-x=-20
Subtract 70 from 50 to get -20.
x=20
Multiply both sides by -1.
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