Question

if 3(x+7)=42,then 5x​

Answer 1

Answer:

3(X+7)=42

3x+21=42

3x=42-21

3x=21

X=7

then 5x

5(X+7)=42

5x+35=42

5x=42-35

5x=7

Answer 2

Answer:

$3(x + 7) = 42 \\ 3x + 21 = 42 \\ 3x = 42 - 21 \\ 3x = 21 \\ x = \frac{21}{3 } \\ x = 7 \\ if \: 5 \\ 5(x + 7) \\ 5x + 35 = 42 \\ 5x = 42 - 35 \\ 5x = 7 \\ x = \frac{7}{5} \\ or \\ x = 1.4$