(x+x+5)*2=84
2x+2x+10=84
4x=84-10
4x=74
x=74:4
x=18,5
PS=18,5
ST=23.5
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(x+x+5)*2=84
2x+2x+10=84
4x=84-10
4x=74
x=74:4
x=18,5
PS=18,5
ST=23.5