First, add like terms (12+7), which would equal to 19. Then isolate the variable by subtracting 19 and adding it to the other side of the equal sign. Now with this new equation of 3x=-19, isolate again by dividing 3 from x and do the same thing to the other side (-19/3). The answer should be -6.33 repeating, but in algebra you would give a more simplified answer. This would be -19/3
