NECESITO hallar el valor de X a) 7x- 8 + 2x = 4x + 17 b) 21+ 10x - 19= 7x + 30 - 4x c) 5 (x + 2) + 2.... Question from @lucila516

¡Notificar abuso! $Resolver.$

$a)$

$7x - 8+2x = 4x + 17$

$7x + 2x - 8 = 4x + 17$

$5x - 8 =4x +17$

$9x = 9$

$x = \frac{9}{9}$

$x = 1$ <===== respuesta

$===================================$

$b)$

$21+10x-19=7x+30-4x$

$21-19+10x=7x-4x+30$

$2+10x=3x+30$

$10x-3x=30-x$

$7x = 28$

$x = \frac{28}{7}$

$x = 4$

$======================================$

$c)$

$5(x+2)+2x=4x+31$

$5x+10+2x=4x+31$

$7x+10 = 4x+31$

$7x - 4x = 31 -10$

$3x=21$

$x = \frac{21}{3}$

$x = 7$

$=======================================$

$d)$

$3(x+7)+2(x+3)=x+39$

$3x + 21 + 2x+6=x+39$

$5x+27=x+39$

$5x-x=39-27$

$4x = 12$

$x = \frac{12}{4}$

$x = 3$

$=================================$

$e)$

$4(3x+1)-x=3x+20$

$12x+4-x=3x+20$

$12x-x+4=3x+20$

$11x + 4 = 3x+20$

$11x - 3x = 20 - 4$

$8x = 16$

$x = \frac{16}{8}$

$x = 2$

$=================================$

$f)$

$2(3+6x)-5=7(x+8)$

$6+12x-5=7x+56$

$6-5+12x = 7x+56$

$1+12x = 7x+56$

$12-7x = 56-1$

$5x = 55$

$x = \frac{55}{5}$

$x =11$

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