Question

Resolva as seguintes equaçoes:
a-)5X+7-X=-1=
b-)2/3(a-1)=3/5(a+2)
c-)28,4m-2=54,8
d-)x-(x=1)=2-3(x-2)

Answer 1

a) 5x+7-x=-1
4x+7=-1
4x=-1-6
4x=-8
x=-8/4
x=-2

b) $\frac{2}{3}$(a-1)=$\frac{3}{5}$(a+2)
$\frac{2(3a-3)}{3}= \frac{3(5a+10)}{5}$
$\frac{6a-6}{3} = \frac{15a+30}{5}$
2a-3=3a+6
2a-3a=6+3
a=-9

c) 28,4-2=54,8
28,4=56,8
$m=\frac{56,8}{28,4}$
m=2

d) x-(x-1)=2-3(x-2)
x(x-1)=2-3x-6
x-x+1=-4-3x
x-x+3x=-4-1
3x=-5
x=-5/3