9 x 9 = 18 is false
do you mean 9x + 9 = 18?
then x =1
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8x+9=9x-18+9 = 8x+9=9x-9 = 1x=0 (:
9x+18 = 180 9x = 180-18 9x = 162 x = 18
9x-5 = 13 Add 5 to both sides: 9x = 18 Divide both sides by 9: x = 2
use algebra and then factor... x= -9 and 9
9x - 8 = 46 9x = 46 +8 9x= 54 9x/9 = 54/9 x= 6