yo, whats the answer to this equation 7x – 3 (x – 6) = 30, what’s x A. 12 B. 9 C. 3 D. 6 HELP

Question

yo, whats the answer to this equation
7x – 3 (x – 6) = 30,
what’s x
A. 12
B. 9
C. 3
D. 6
HELP

0

Answers ( No )

    0
    2021-10-14T01:11:43+00:00

    The Answer is C: 3 

    Proof:

    Solve for x:
    7 x – 3 (x – 6) = 30

    -3 (x – 6) = 18 – 3 x:
    7 x + 18 – 3 x = 30

    Grouping like terms, 7 x – 3 x + 18 = (7 x – 3 x) + 18:
    (7 x – 3 x) + 18 = 30
    7 x – 3 x = 4 x:
    4 x + 18 = 30

    Subtract 18 from both sides:
    4 x + (18 – 18) = 30 – 18
    18 – 18 = 0:
    4 x = 30 – 18
    30 – 18 = 12:
    4 x = 12

    Divide both sides of 4 x = 12 by 4:
    (4 x)/4 = 12/4
    4/4 = 1:
    x = 12/4
    The gcd of 12 and 4 is 4, so 12/4 = (4×3)/(4×1) = 4/4×3 = 3:
    Answer:  x = 3

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