9 x 20 = 180
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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 checks
6x-20 = 34 +20 +20 6x = 54 /6 /6 x = 9
x=6=x=5+x=13+x=20 x cannot = x+5. This question has no answer.
x ≠11 9 + x = 21 9 + x - 9 = 21 - 9 x = 12
If you mean: x2+9x+20 then it is (x+4)(x+5) = 0 when factored