Solve for a
a=5.1
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3=-2.1+a
Multiply -0.7 and 3 to get -2.1.
-2.1+a=3
Swap sides so that all variable terms are on the left hand side.
a=3+2.1
Add 2.1 to both sides.
a=5.1
Add 3 and 2.1 to get 5.1.
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