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3x+19=4x-10
19+10=4x-3x
29=x
Pasamos términos semejantes a un lado de la igualdad sabiendo que si esta sumando pasaría a restar o viceversa
5x-2x-4x = -10-7-12
-1x = -29
-29
x = -------------- = 29------------- (-) . (-)= +
-1