Solve for x, y, z, a
a=6
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x+12=0
Consider the first equation. Variable x cannot be equal to -21 since division by zero is not defined. Multiply both sides of the equation by x+21.
x=-12
Subtract 12 from both sides. Anything subtracted from zero gives its negation.
x=-12 y=6 z=6 a=6
The system is now solved.
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