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5x+7=15x-7
7+7=15x-5x
14=10x
x=1.4
Pasamos términos semejantes aun lado de la igualdad, sabiendo que si esta sumando pasa al otro lado restando o viceversa.
1+6+4+3 = 14x - 2x - 3x + x
14 = 14x-5x+x
14 = 10x
14/10 =x
1.4 =x