3x=9 means 3 times a number is equal to 9.
Divide both sides by 3.
1) 3x/3=9/3
Dividing 3x by 3 cancels the 3 from the x.
2) 3x/3=9/3
Cleaning up the equation looks like this:
3) x=9/3
Solve the right side.
4) x=3
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3x-11 for x=9
x - 7 - 9 = -3x - 16 = -3x = 13
24 = 3x + 9 -9 -9 Subtract 9 from each side15 = 3x/3 /3 Divide 3 from each side5 = x You are left with five equals X
172=x
3x + 9 = 42 3x = 33 x = 11