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-2x-7=2x-7
-2x-2x=-7+7
-4x=0
x=0
2)
-27x+1=2x+59
-27x-2x=59-1
-29x=58
x=-2
3)
45x-19=19x-45
45x-19x= -45+19
26x= -26
x= -1