Two-Step with Decimals

The equation $1.2x+0.4 = 2.8$ is a two-step equation with decimals. You solve it in the same order as before: subtract 0.4 from both sides, then divide both sides by 1.2.

$$1.2x = 2.4$$

$$x = 2$$

The decimals change the arithmetic, not the order of the steps. Check the answer: $1.2\cdot 2+0.4 = 2.8$.

If you prefer whole numbers, multiply every term by 10 first. That gives $12x+4 = 28$, and you solve it with whole numbers. Multiplying by 10 clears a denominator of 10, because $1.2 = \frac{12}{10}$ and $0.4 = \frac{4}{10}$. Either way the equation has the same two steps: undo the added number, then undo the coefficient.