Question

resolva as seguintes equações, sendo U= Q

a) 7x + 6 = 36
b) 9x - 74 = 11x
c) 57 = 3x
d) 49 = 6x + 7

Answer 1

a) 7x+6=36
7x=36-6
X=
$\frac{30}{7}$

b) 9x-74=11x
9x-11x=74
-2x=74
×-1= 2x=-74

c) 57=3x
-3x=-57
×-1=
3x=57
X= 57/3 x=19

d) 49=6x+7
-6x=+7-49
-6x=-42
×-1=
6x=42
x=42/6
x= 7