Suppose Xiao Yong votes X, then Dad votes 6x.
x+6x=42
7x=42
x=6?
Dad: 6x = 6x = 6x=6×6=36.
Solve the equation and write the inspection process:
1. Substitute the unknown value into the original equation.
2. What's on the left? Is it right?
3. Judge whether the unknown value is the solution of the equation.
For example: 4.6x=23
Solution: x=23÷4.6
x=5
Check:
Substituting x = 5 into the equation, we get:
Left =4.6×5
=23= Right
So x=5 is the solution of the original equation.