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Resolvemos.
5 (7+4x)-15-8x=92
35 + 20x - 15 - 8x = 92
20x - 8x + 35 - 15 = 92
12x + 20 = 92
12x = 92 - 20
12x = 72
x = 72/12
x = 6
Respuesta.
x = 6
VERIFICAMOS LA SOLUCIÓN
5 (7+4x)-15-8x=92
5 (7 + 4 * 6) - 15 - 8 (6) = 92
5 (7 + 24) - 15 - 48 = 92
5 (31) - 63 = 92
155 - 63 = 92
92 = 92
La solución es correcta!!!
35+20x-15-8x=92
35-15+20x-8x=92
20+12x=92
12x=92-20
12x=72
x=6
comprobamos
5(7+4x)-15-8x=92
5[7+4(6)]-15 -8(6)=192
5[7+24]-15-48=92
5[31]-15 -48=92
155-15-48=92
155-63=92
92=92