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Ajutor!

3) a) Solutia ecuatiei 8x + 1 = 5x - 5 este x = ...

b) Daca 3/4 = 3-x/12, atunci x = ...


Răspuns :

a)8x-5x=-5-1
3x=-6
x=-6/3
x=-2
b)3/4=(3-x)/12
4(3-x)=12×3
3-x=36:4
3-x=9
x=3-9
x=-6
8 x + 1 = 5x - 5
8x - 5x = -5 - 1
3x = - 6
x = - 6 : 3
x = - 2

3 / 4 = 3 - x / 12
9 / 12 = 3 - x / 12
9 = 3 - x
9 - 3 = - x / -
x = - 6