Calculer x dans chacun des cas suivants : a) X-(-5,4 + 4,2) = 4,2-15-9)
b) (-12,5) + x - (-12,5 + 3) = 6,5-(3,2-7,1)
c) -12- (-4) + (-5 - x) = -32-[(-42)-37]. svp aider moi​
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