Question

State which of the following are equation (with a variable) given reason and tell your answer. identify the variable from the equation with a variable.
$7=(11\ast 5)-(12\ast 4)$

Answer 1

$7=11\times 5-12\times 4$

$7=55-48$

$\Rightarrow 7=7$(identity)

Above is an identity as it won't contain a variable.