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2. x = 3
3. x = -2
4z+2z=24-6
6z=18
z=18/6
z=3
2.2(x+3)+3(x-4)=9
2x+6+3x-12=9
5x-6=9
5x=9+6
5x=15
x=5
3.9(x-4)+2(1+4x)=0
9x-36+2+8x=0
17x=36-2
17x=34
x=34/17
x=2