9 x (x is an integer), when x equals () the number equals 0

9 x (x is an integer), when x equals () the number equals 0


When x equals (0), the number equals 0



The square of x plus nine, x equals zero


x^2+9x=0
x(x+9)=0
x1=0,x2=-9



2 / 9 plus 4 / 7 plus 7 / 9 minus 31 / 7


Original formula = (2 / 9 + 7 / 9) + (4 / 7-3 / 7)
=1-1/7
=6/7
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