5x-9
Substitute 4 in for x
5(4)-9=
Solve.
9-9=0
the answer is zero.
The answer is not zero you added when you were supposed to multiply so the real answer is 11.
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5x + 4 = 10x - 5 10x - 5x = 4 + 5 5x = 9 x = 1.8
5x-x=36 4x=36 x=36/4 x=9
If X = 9 then 5X would = 5 x 9, which is 45.
172=x
x=4