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6+15 = 5x - 3x
21 = 2x
x= 10.5
Comprueba si está bien:
3(10.5+2) = 5(10.5-3)
3*12.5 = 5* 7-5
3*12.5 = 37.5
5*7.5= 37.5
II) 4x-8 - 3x + 9 = 2+2x
x + 1 = 2 + 2x
1 - 2 = 2x - x
-1 = x
Para saber si está bien:
4(-1-2) - 3(-1-3) = 2 + (-2)
(4 * -3) - (3*-4) = 2 - 2
-12 + 12 = 2-2
0 = 0