12x-4y+9z+2y =12x-2y+9z
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4z + 2 + 5z - 3 = 9z - 1
Since 9z is a multiple of 3z, it is automatically the LCM.
The above expression simplifies to 2x-y+9z
2 + 14z = -8 + 9zSubtract 9z from each side:2 + 5z = -8Subtract 2 from each side:5z = -10Divide each side by 5:z = -2
9x + 3y + 5z - 5x + 4z - 7y = 4x - 4y + 9z