Simplify 3(7x)-2(4-x)

$3 (7 x) - 2 (4 - x)$

Simplify each term.

Multiply $7$ by $3$ .

$21 x - 2 (4 - x)$

Apply the distributive property.

$21 x - 2 \cdot 4 - 2 (- x)$

Multiply $- 2$ by $4$ .

$21 x - 8 - 2 (- x)$

Multiply $- 1$ by $- 2$ .

$21 x - 8 + 2 x$

$21 x - 8 + 2 x$

Add $21 x$ and $2 x$ .

$23 x - 8$

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