Question

the opposite of addition is _______________, an operation often used to isolate the variable in an equation.
the technique of solving a linear equation by first clearing any fractions by multiplying through by a common denominator is known as _______________ fractions.

Explanation:

The first blank refers to the inverse operation of addition, which is subtraction, used to isolate variables. The second blank describes the technique of removing fractions in equations by multiplying by a common denominator, called clearing fractions.

Answer:

subtraction
clearing