Calcule o valor de x nas equaçoes, sendo u = z
a) 5x=4x - 9
b) 2x+6= x
c) 3x + 8 = 2x -3
d) 7x + 9 - 2x =20 + 4x +1
a) 5x=4x - 9
b) 2x+6= x
c) 3x + 8 = 2x -3
d) 7x + 9 - 2x =20 + 4x +1
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5x-4x=-9
x=-9
b) 2x+6=x
2x-x=-6
x=-6
c) 3x+8=2x-3
3x-2x=-3-8
x=-11
d) 7x+9-2x=20+4x+1
7x-2x-4x=20+1-9
7x-6x=20-8
x=12