Subtract 9 from each side. ( subtraction; both sides )
X + 9 = 20
X + 9 - 9 = 20 - 9
X = 11
-----------------check in original equation
11 + 9 = 20
20 = 20
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Addition=^^=
Addend plus addend equals sum Minuend minus subtrahend equals difference Multiplicand times multiplier equals product Dividend divided by divisor equals quotient
http://authors.library.caltech.edu/25030/7/05_Calc1_Chapter2w.pdf visit.
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144 (square the first value and add the product of the two values). In the statement 7 + 6 should = 91, not 63, which would be 7 + 2.