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4x-5-2x-6=-4
2x-11=-4
2x=7
x=3,5
b5(2x-9)≤ - 15
10x-45≤-15
10x≤30
x≤3
5x-15=65
5x=80
x=16
4x-5-2x-6=-4
2x=7
x=7/2
b 5(2x-9)≤- 15
10x-45≤- 15
10x≤30
x≤3
5x-15=65
5x=80
x=16
4x-5-2x-6=-4
2x-11=-4
2x=-4+11
2x=7/:2
x=7/2=3,5
b5(2x-9)_< - 15
10x-45≤-15
10x≤-15+45
10x≤30/:10
x≤3
x∈(-∞,3>
5x-15=65
5x=65+15
5x=80/:5
x=16