Question

How do you solve `4.2m+4=2.5`?

Answer 1

Except for attempting to divide by zero, you can perform the same basic arithmetic operation to both sizes on an equation and the equation remains valid.

Starting with
`4.2 m + 4 = 2.5`

Subtract `4` from both sides of the equation:
`4.2 m = -1.5`

Divide both sides by `4.2`
`m =- 5/14 = -0.3571...`