Question

Me ajudem por favor
a. 5x+20(-1x)=5
b. -x+4(2-x) = -2x-(10+3x)
c. 2x - 1/2=5x/2+ 4/3

Answer 1

5x + 20 ( -x) = 5
5x - 20x = 5
-15x = 5
15x = -5
x = -5/15 = - 1/3 ***

b
-x + 4( 2 - x) = -2x - ( 10 + 3x)
-x + 8 - 4x = -2x -10 - 3x 
-x - 4x + 2x + 3x  = -10 - 8
0x = -18
x = -18/0 = 0

c
2x/1 - 1/2 = 5x/2 + 4/3
mmc = 6
12x - 3 = 15x + 8
12x - 15x = 8 + 3
-3x = 11
3x = -11
x = -11/3 ***