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x/3 = 2 - 6 resuelves la resta
x/3 = - 4 El 3 esta dividiendo pasa al otro lado multiplicando
x = - 4(3)
x = - 12
Comprobación:
-12/3 + 6 = 2
- 4 + 6 = 2
2 = 2
2) 1 - x/5 + x + 1/4 = 3x/20 + 1
- x/5 + x - 3x/20 = 1 - 1 - 1/4
- x/5 + x - 3x/20 = - 1/4 igualar denominadores a 20
-x(4)/5(4) + x(20)/1(20) - 3x/20 = -1/4
-4x/20 + 20x/20 - 3x/20 = -1/4
-4x + 20x - 3x /20 = - 1/4
-4x - 3x + 20x /20 = -1/4
-7x + 20x /20 = - 1/4
13x/20 = - 1/4 el 20 esta dividiendo pasa a multiplicar
13x = -1/4 (20)
13x = - 20/4
13x = - 5 despejar x
x = -5/13
Comprobación:
1 - (-5/13 / 5) + (-5/13) + 1/4 = 3/20 (-5/13) + 1
1 +(5/13 / 5/1) - 5/13 + 1/4 = - 15/260 + 1
1 + 5/65 - 5/13 + 1/4 = -15 + 260/ 260
1 + 1/13 - 5/13 + 1/4 = 245/260 igualar al m.c.m. 260 los denominadores
260(1) / 260 + 1(20) / 13(20) - 5(20)/13(20) + 1(65) / 4(65) = 245/260
260 + 20 - 100 + 65 = 245/260
260 + 20 + 65 - 100 / 260 = 245/260
345 - 100 /260 = 245/260
245/260 = 245/260
3) 2,5x - 3 = 0,5x
2,5x - 0,5x = 3
2x = 3
x = 3/2
x = 1.5
Comprobación
2,5(1,5) - 3 = 0,5 (1.5)
3,75 - 3 = 0,75
0,75 = 0,75
4) 4x - 2 = x
4x - x = 2
3x = 2
x = 2/3
Comprobación:
4(2/3) - 2 = 2/3
8/3 - 2 = 2/3
8 - 6/3 = 2/3
2/3 = 2/3
5) 11 = x + 4,5
11 - 4,5 = x
6,5 = x
Comprobación:
11 = 6,5 + 4,5
11 = 11
Servida