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a) 4x+8
4 x 5+8=28
b) 2,5x=12
2,5 x 5=12
12,5=12
2. K=13x-5y
K=13 x 7-5 x 11
K=91-55
k=36
a) z+7z-4z = 4z
b)2y-6+4x+4+y = -2+3y+4x
c)5x+15-x-10 = 5+4x