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-x+7x<_3-15
6x<_-12
x<_-12/6
x<_-2
b) x+11>_3+7x
x-7x>_3-11
-6x>_-8
x>_-8/-6
x>_4/3
c) -x-13<_3+7x
-x-7x<_3+13
-8x<_16
x<_16/-8
x<_-2
d) 2x+11>_6+5x
2x-5x>_6-11
-3x>_-5
x>_5/3