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2014-10-10T08:32:35+03:00
A.75-x=5a+5b
75-x=5(a+b)
75-x=5*8
75-x=40
x=75-40
x=35


b.x*a+x*b=24
x(a+b)=24
x*8=24
x=24/8
x=3


c.4x-3(a+b)=8
4x-3*8=8
4x-24=8
4x=8+24
4x=32
x=32/4
x=8
2 5 2
2014-10-10T08:33:09+03:00
A. 75-x=5(a+b)  => 75-x=5*8  => x=35

b. x(a+b)=24  => 8x=24  => x=3

c. 4x-3*8=8  => 4x=32  => x=8