Subtract 4 from both sides.
12x = 4x - 24
Subtract 4x from both sides.
8x = -24
x = -3
Check it.
-36 + 4 = -12 - 20
-32 = -32
It checks.
6x + 12x + 2x = 80 20x = 80 x = 4
9x + 2 = 12x + 14 -3x = 12 x = -4
12x - 8 = 10x + 42x = 12x = 6
8x-3+6x-1 = 12x+614x-4 = 12x+614x-12x = 6+42x = 10x = 5
2*2 - 12x +16 =0 4 - 12x +16 =0 -12x + 16 +4 =0 -12x + 20 =0 -12x = -20 x = 1.666666667
x2 + 12x - 64 = 0 ∴ (x + 16)(x - 4) = 0 ∴ x ∈ {4, -16}
It is: 122-4*(9*-2) = 216
12x - 6 = 10x +2 12x - 10x = 2 + 6 2x = 8 x = 4
Subtract 7 from each side: 12x = 8x + 16Subtract 8x from each side: 4x = 16Divide each side by 4: x = 4
2x + (10x - 4) = 20 2x + 10x - 4 = 20 12x - 4 = 20 12x = 24 x = 2
x works out as 5/3
y = - 4x - 4