1. **State the problem:** Solve for $x$ in the equation $70 = 42 + 25 - 6 + x$. 2. **Combine like terms on the right side:** $$42 + 25 - 6 = 42 + 19 = 61$$ So the equation becomes: $$70 = 61 + x$$ 3. **Isolate $x$ by subtracting 61 from both sides:** $$70 - 61 = \cancel{61} + x - \cancel{61}$$ $$9 = x$$ 4. **Final answer:** $$x = 9$$ This means that when you add 9 to 42 plus 25 minus 6, the total equals 70.