Question 346958
15x - 2 = 21x + 10


All you have to do is combine like terms.



Don't forget to change the signs when crossing the equal sign.



15x - 21x = 2 + 10


-6x = 12


x = 12/-6


x = -2


THE PROOF:


Let x = -2


15(-2)-2 = 21(-2) + 10


-30 - 2 = -42 + 10


-32 = -32...It checks!!


We now know that x = -2 is right.