Answer:
x = 6
Step-by-step explanation:
Substitute y = - 4 into the equation and solve for x
6x + 7(- 4) = 4x + 4(- 4) ← evaluate
6x - 28 = 4x - 16 ( subtract 4x from both sides )
2x - 28 = - 16 ( add 28 to both sides )
2x = 12 ( divide both sides by 2 )
x = 6
