Francis mixes 3/4 gal of white paint, 2 7/8 gal of blue paint, and 1 1/4gal of red paint. How much white paint will Francis need to make 7 gal of the same color paint.

It's like discovering the answer to a puzzle. the purpose in solving an equation is to find the value or values of the variable that makes it a true statement. any value of the variable that makes the equation true is called a solution to the equation.