3c-3d= mx-my= 7a-7b-7c=19.4 °F

The equations you're presenting seem to be algebraic expressions. Let's break them down one by one: 1. **For equation 1**: \[ 3c - 3d = 3(c - d) \] This means that the difference between \( c \) and \( d \) is multiplied by 3. 2. **For equation 2**: \[ mx - my = m(x - y) \] This shows that the difference between \( x \) and \( y \) is multiplied by \( m \). 3. **For equation 3**: \[ 7a - 7b - 7c = 19.4°F \] This can be rewritten as: \[ 7(a - b - c) = 19.4°F \] To isolate \(a - b - c\), you would divide both sides by 7: \[ a - b - c = \frac{19.4°F}{7} \approx 2.7714°F \] If you have specific variables (like \( c, d, m, x, y, a, b \)) with known values, or if you want to solve these expressions under certain conditions, please provide more information!