Holly M. answered 09/18/15
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Systems Engineer with 5+ years of tutoring experience
ST+TU=SU
ST=TU
SU/2=ST=TU
5x-2=3x-4
2x=-2
x=-1
ST=5x-2=5(-1)-2=-5-2=-7 --->|ST|=7
TU=3x-4=3(-1)-4=-3-4=-7 --->|TU|=7
ST+TU=SU ---> 7+7=14