If 3(x −1) = 21, value of 7x is
Answers
Answered by
5
Step-by-step explanation:
3(x-1)=21
3x-3=21
3x=21-3
x=18/3
x=6
therefore , 7x = 7×6=42
Answered by
3
Answer:
8
Step-by-step explanation:
Solve for x:
3 (x - 1) = 21
Divide both sides of 3 (x - 1) = 21 by 3:
(3 (x - 1))/3 = 21/3
3/3 = 1:
x - 1 = 21/3
The gcd of 21 and 3 is 3, so 21/3 = (3×7)/(3×1) = 3/3×7 = 7:
x - 1 = 7
Add 1 to both sides:
x + (1 - 1) = 1 + 7
1 - 1 = 0:
x = 7 + 1
7 + 1 = 8:
Answer:
x = 8
7x = 7×8 = 56
By the way, you are a moron who can't even solve these kinda things.
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