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2014-08-10T13:49:59+03:00
X+x+5+x+10+x+15+x+20+x+25=165

6x+ 75=165

6x=165-75

6x=90

x=15

x+5=15+5=20
x+10=15+10=25
x+15=15+15=30
x+20=15+20=35
x+25=15+25=45

b)x+x+7+x+14+x+21=154

4x+42=154

4x=154-42

4x=112

x=28

x+7=28+7=35
x+14=28+14=42
x+21=28+21=49