HELP PLS PLS I BEG U GEOMETRY AREA OF SECTOR

How can you solve an equation with a variable on both sides? complete the explanation. you can solve the equation by using *(blank)* operations to get the variable terms on one side of the equal sign and the constant terms on the *(blank)* side. then *(blank)* both sides by the coefficient of the resulting variable term.

Ineed to learn how to solve this problem

Anyone know these questions? i need ,.