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a=3x+2y
b= 10x-4y
c=?
c= L-( a+b)
c= 34x-5y - (3x+2y + 10x - 4y)
c= 34x - 5y - 13x-2y
c= 21x-7y
ODP.: Ramię trapezu równoramiennego wynosi 21x-7y