1) minus 4 from both sides
2) x=5
the long explanation...x+4=9
so, you subtract 4 from both sides of the equation...
x+4 -4 = 9 -4
And, that simplifies to
x=5
done! the answer is 5!
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h= -4
172=x
A + 9 = 21 A = 21 - 9 A = 12
2*2+4x-9=0 4x=9-4 4x=5 x=5/4
-9-2x+x = -13 -2x+x = -13+9 -x = -4 x = 4