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x + 1.9x = 92.80
1° reducir términos semejantes
sumar los términos en x
2.9x = 92.80
2° despejar incógnita
2.9 que multiplica a x, pasa dividiendo al lado derecho de =
x = (92,80)/(2.9)
3° efectuar
x = 32
x = 32
Compruébalo !!