3 years ago

- 4 x + 9 = 21 x=___ help

Mathematics

2 answers:

faust18 [17]3 years ago

4 0

X=-3
because
-4x=21-9
-4x= 12 divide both sides
x=-3

Leto [7]3 years ago

3 0

Answer:

$- 4x + 9 = 21 \\ - 4x = 21 - 9 \\ = 12 \\ x = \frac{12}{ - 4} \\ x = - 3$

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