4(x-2y+4z)-6(x+2)=4x-8y+16z-6x-12=-2x-8y+16z-12
-2*1/2-8*4+16*(-2)-12=-1-32-32-12=-77 x=1/2 y=4 z=-2
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4(x-2y+4z)-6(x+2)=4x-8y+16z-6x-12=-2x-8y+16z-12
-2*1/2-8*4+16*(-2)-12=-1-32-32-12=-77
x=1/2
y=4
z=-2
-4x-8y+16z-12 /:2
-2x-4y+8z-6
-1-4*4+8*(-2)-6
-1-16-16-6
-37