x=7
Solve for x:
3 x + 4 = 25
Subtract 4 from both sides:
3 x + (4 - 4) = 25 - 4
4 - 4 = 0:
3 x = 25 - 4
25 - 4 = 21:
3 x = 21
Divide both sides of 3 x = 21 by 3:
(3 x)/3 = 21/3
3/3 = 1:
x = 21/3
The gcd of 21 and 3 is 3, so 21/3 = (3×7)/(3×1) = 3/3×7 = 7:
Answer: x = 7