a= 3 *x+3*6 b= 5*6-5*y c= -7*2z+7*3
a= 3x+ 18 b=30-5y c= -14z+21
d= -8*-5+8*3y e= 6*4x-6*9
d=40+24y e=24x-54
f= -12*-5-12*3z
f=60-36z
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a= 3 *x+3*6 b= 5*6-5*y c= -7*2z+7*3
a= 3x+ 18 b=30-5y c= -14z+21
d= -8*-5+8*3y e= 6*4x-6*9
d=40+24y e=24x-54
f= -12*-5-12*3z
f=60-36z