8x+39 = 2x-15 6x = -54 x = -9
If I understand the question correctly: 2x=39 then x=39/2 or x=19.5
2x+a=p 2x=p-a x=.5p-.5a
x2 + 2x - 38 = 0 ∴ x2 + 2x + 1 = 39 ∴ (x + 1)2 = 39 ∴ x + 1 = ±√39 ∴ x = -1 ±√39
2x + 5 - 5 = 2x. You can not solve for x because this is not an equation.
2x - 5 = 15 2x = 20 x = 10
2x - 3= 9 x=
2x + 3 = x 2x + 3 - 3 = x - 3 2x = x - 3 2x - x = x - 3 - x x = -3
-1711
To solve this equation we have to isolate and solve for x. So: 2x-6= x+5 +6 +6 2x = x+11 -x -x x = 11 So x=11.
This is 41x
Their ages: x+5+x = 39 => 2x+5 = 39 => 2x = 39-5 => 2x = 34 => x = 17Therefore: Mary is 17+5 = 22 years and Bob is 17 years