Step-by-step explanation:
21 (2-x)+12x=44
first,open the brackets
42-21x+12x=44
second, collect like terms
42-9x=44
-9x=44-42
-9x=2
third, dived both sides by -9
-9x/-9 = 2/-9
[tex]x = \frac{2}{ - 9} [/tex]
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