Question

Me ajudem preciso dos cálculos

Answer 1

a) 2x+(9-x)=8-(3x-6)

2x+9-x=8-3x+6

2x-x+3x=8+6-9

4x=5

x=5/4

b)8(2x-1)=6(5x-2)-10

16x-8=30x-12-10

16x-30x=-12-10+8

-14x=-14

x=-14:-14⇒x=1

c)y-{y-(2-y)-1}+4=-(-3-y)

y-{y-2+y-1}+4=3+y

y-{2y-3}+4=3+y

y-2y+3+4=3+y

y-2y-y=3-4-3

-2y=-4

y=-4:(-2)

y=2

d) 2(x-2)-3(1-x)=20-(x-4)

2x-4-3+3x=20-x+4

2x+3x+x=20+4+3+4

5x=31

x=31/5