3(x-4)=3 [divide by making use of three throughtout] (x-4)=0 [boost the bracket and convey the 4 over] x=4 it is erroneous by using fact 3/3 isn't equals to 0 yet to a million. so 3 (x-4) = 3 x - 4 = a million x = 4 + a million x = 5 you additionally can confirm it: 3 (5 - 4) = 3 3 = 3 a million = a million So it is the suitable root of the equation.
First expand the brackets
3xz - 3x1 = 5x2z - 5x3
3z-3=10z-15
Gather the unknowns to one side and the constants to the other
Subtract 3z from both sides
3z-3z-3 = 10z-3z-15
-3=7z-15
Add 15 to both sides
-3+15=7z-15+15
12=7z
Divide both sides by 7 to give the answer
z=12/7
You can then check this by substituting this into the formula
3(12/7 - 1) = 3x5/7 = 15/7
5(2x12/7-3) = 5(24/7-3) = 5x3/7 = 15/7