0
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b+9=2
sbtract nine both sides
b=2-9
b=-7
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A + 9 = 21 A = 21 - 9 A = 12
(3x - 7)(2x + 9) = 0 x = 7/3 or -9/2
2x + 1 = 9 2x = 9 - 1 2x = 8 2x/2 = 8/2 x=4
2*2+4x-9=0 4x=9-4 4x=5 x=5/4
9x = 60x = 60/9 = 6 2/3 (or 6.67)