Solve 21*m*2+(m-50)*336+(-20*25*42)=0

$$21 \cdot m \cdot 2 + ( m - 50 ) \cdot 336 + ( - 20 \cdot 25 \cdot 42 ) = 0$$

Solve for m

$$m=100$$

Steps for Solving Linear Equation

Multiply 21 and 2 to get 42.

$$42m+\left(m-50\right)\times 336-20\times 25\times 42=0$$

Use the distributive property to multiply m-50 by 336.

$$42m+336m-16800-20\times 25\times 42=0$$

Combine 42m and 336m to get 378m.

$$378m-16800-20\times 25\times 42=0$$

Multiply -20 and 25 to get -500.

$$378m-16800-500\times 42=0$$

Multiply -500 and 42 to get -21000.

$$378m-16800-21000=0$$

Subtract 21000 from -16800 to get -37800.

$$378m-37800=0$$

Add 37800 to both sides. Anything plus zero gives itself.

$$378m=37800$$

Divide both sides by 378.

$$m=\frac{37800}{378}$$

Divide 37800 by 378 to get 100.

$$m=100$$