33-a=90-70
90-70=20
a=33-20
a=13
17+x=33+27
33+27=60
x=60-17
x=43
70-b=88-45
88-45=43
b=70-43
b=27
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33-a=90-70
90-70=20
a=33-20
a=13
17+x=33+27
33+27=60
x=60-17
x=43
70-b=88-45
88-45=43
b=70-43
b=27