Solve 42=d-c*3

$$42 = d - c \cdot 3$$

Solve for c

$$c=\frac{d-42}{3}$$

Steps for Solving Linear Equation

Swap sides so that all variable terms are on the left hand side.

$$d-c\times 3=42$$

Multiply -1 and 3 to get -3.

$$d-3c=42$$

Subtract d from both sides.

$$-3c=42-d$$

Divide both sides by -3.

$$\frac{-3c}{-3}=\frac{42-d}{-3}$$

Dividing by -3 undoes the multiplication by -3.

$$c=\frac{42-d}{-3}$$

Divide 42-d by -3.

$$c=\frac{d}{3}-14$$

Solve for d

$$d=3\left(c+14\right)$$

Solution Steps

Swap sides so that all variable terms are on the left hand side.

$$d-c\times 3=42$$

Add c\times 3 to both sides.

$$d=42+c\times 3$$