$\"\"$

The sentence is, “twice a number $\"\"$ decreased by 8 equals 70”.

The word “decreased “indicates the symbol “ $\"\"$ ”.

The word “twice a number $\"\"$ ” can be represented as “2t”.

The word “equals” can be represented as “ $\"\"$ ” symbol. $\"\"$

Rewrite the sentence into equation,

$\"\"$ $\"\"$

The equation is $\"\"$