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6w-4w=4
2w=4 /:2
w=2
13. -2x-12=3z-13
-2x-3z=12-13
-5xz=-1 /:(-5)
xz=0,2
14. -x+7=5x+1
-x-5x=-7+1
-6x=-6 /:(-6)
x=1