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3a-3b+4,5=3(.....a-......+.......)

-2,5a+7,5b-10=2,5(.....-.....+....)

-3 x+9 -12 = 1 (.....-......+.....)

4 124 16 16

-36x -81 -4,5y =-4,5(....+.....+......)


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