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I - 2x+1
II - 2x+1+2=2x+3
III 2x+3+2=2x+5
IV 2x+5+2=2x+7
2x+1+2x+3+2x+5+2x+7=216
8x+16=216
8x=200 |:8
x=25
I - 2*25+1=51
II - 2*25+3=53
III - 2*25+5=55
IV - 2*25+7=57