6th grade math help this is usually easy for people !

For the equations below which statement is true ? -2x=14 6x=-42

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.