ENCONTRAR EL VALOR DE X

EXAMEN 5
ENCONTRAR EL VALOR DE X
#1
2X+5+6X=10
2X+6=10-5
8X=5
X=8/5
X =0.625

#2 4x+9/5 + 8X+9/7=121
4x/5 + 9/5 +8x/7+9/7 =121
0.8x +1.8+1.14x+1.28=121
0.8x+1.14x = 121-1.28
1.94x = 119.72
X = 119.72/1.94
X =61.71

#3 9/7(3/x +4/8) = 0.7
(1.2857) (3/x) + (1.2857) (4/8) =0.7
(1.2857/1) (3/1) + (1.2857) (4/8) =0.7
3.8571/x + 5.1428/8 =0.7
3.8571/x -0.6429 =0.7
3.8571/x =0.7-0.6429
3.8571/x = 0.0571
3.8571 =x (0.0571)
3.8571/0.0571 =x
67.5499 = x
X =67.5499