А) 5(7-2х)+15≥6(х-5)
35-10х+15≥6х-30
-10х-6х≥-30-35-15
-16х≥-80
х≥5
Б) 9(z+4)-2(6z-8)>2z
9z+36-12z+16>2z
9z-12z-2z>36-16
-5z>20
z=-4
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Answers & Comments
А) 5(7-2х)+15≥6(х-5)
35-10х+15≥6х-30
-10х-6х≥-30-35-15
-16х≥-80
х≥5
Б) 9(z+4)-2(6z-8)>2z
9z+36-12z+16>2z
9z-12z-2z>36-16
-5z>20
z=-4