Question

The solution of the equation 3x + 7 = -20
(a) 17\7

(b) -9
(c) 9
(d) 13\3

Answer 1

Answer:

-9

Step-by-step explanation:

$3x + 7 = - 20 \\ 3x = - 20 - 7 \\ 3x = - 27 \\ x = - \frac{27}{3} = - 9$

Answer 2

Answer:

(b) -9

Step-by-step explanation:

1.Subtract

7

7

7

from both sides of the equation

3

+

7

=

−

2

0

3x+7=-20

3x+7=−20

3

+

7

−

7

=

−

2

0

−

7

2.Simplify

Subtract the numbers

Subtract the numbers

3

=

−

2

7

3.Divide both sides of the equation by the same term

3

=

−

2

7

3x=-27

3x=−27

3

3

=

−

2

7

3

4.Simplify

Cancel terms that are in both the numerator and denominator

Divide the numbers

5.x = -9