Question

-5x + x + 9 = -4x + 12

Answer 1

-5x + x + 9 = -4x + 12

-4x+9= -4x+12

move +9 to the other side

sign changes from +9 to -9

-4x+9-9= -4x+12-9

-4x= -4x+3

move -4x to the left side

sign changes from -4x to +4x

-4x+4x= -4x+4x+3

0= 0+3

0= 3

Answer: no solution