Answer:
x = 5
Explanation:
2x + 4x - 7 = 23 ( collect like terms on left side )
6x - 7 = 23 ( add 7 to both sides )
6x = 30 ( divide both sides by 6 )
x = 5
As a check
substitute x = 5 into the left side of the equation and if equal to the right side then it is the solution.
2(5) + 4(5) - 7 = 10 + 20 - 7 = 30 - 7 = 23 = right side
then x = 5 is the solution to the equation