What is the solution for x in the equation? 3x − 42 = -6x + 21

Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin

Ineed in figuring out this problem.

Jake bakes and sell apple pies. he sells each pie for $5.75 . the materials to make the pies cost $40. the boxes jake puts the pies in cost & 12.50 total. how many pies does jake need to sell to earn a profit of $50