Question

faça as que derem pfvr façam o q dder para ver

Answer 1

d) 5x + 3 = 2x + 33  => 5x - 2x = 33 - 3  =>  3x = 30   => x = $\frac{30}{3}$ => x = 10

e)  2*(x - 6) = 4(x + 2)    =>   2x - 12 = 4x + 8   =>  2x - 4x = 8 + 12 =>  -2x = 20 *(-1)  = 2x = -20  =>  -$\frac{20}{2}$  =>  x= -10

f) 5 - 3(1 - 2x) = 3x - 13   =>   5-3+2x = 3x - 13   =>  2 + 2x = 3x - 13  => 2x -3x = -13 - 2 =>   -x = - 15 *(-1)   =>   x = 15

g) 25 + 4(3x- 8) - 2(x+ 6) = x -9  =>   25 + 12x - 32 - 2x + 12 = x - 9   =>  12x - 2x - x = -9 -25 + 32  => 9x = - 2  =>   x= $- \frac{2}{9}$

h) y - 2(y-1) = 7 - 3(y - 2)  =>  y - 2y + 2 = 7 -3y + 6   =>   y - 2y + 3y = 7 + 6 - 2 => 2x  =   11   =>   x = $\frac{2}{11}$

i)  $\frac{3}{4} - \frac{y}{6} = \frac{y}{8} - \frac{1}{3} => \\ \\ \frac{18 -4y = 3y -8 }{24} => 18- 4y = 3y - 8 => -4y - 3y = 18 -8 => \\ \\ -7x = 10 *(-1) \\ \\ 7x = -10 x = -\frac{x}{y}$

j)  $\frac{x-2}{3} + \frac{2x-8}{4} = \frac{8x-12}{2} \\ \\ \frac{4x-8 + 6x -24 =48x - 72 }{12} \\ \\ 4x-8 + 6x -24 =48x - 72 => 4x + 6x - 48x = -72 + 24 + 8 => \\ \\ -38x = - 40 *(-1) => 38x = 40 \\ \\ x = \frac{38}{40} ==== x = \frac{19}{20}$

k)  $\frac{x+2}{2} - \frac{2x-3}{3} = \frac{3x+1}{4} => \frac{12x+6 - 8x -12 = 9x +3}{12} \\ \\ 12x+6 - 8x -12 = 9x +3 => 12x - 8x - 9x = 3 + 12 -6 => \\ \\ -5x = 9 *(-1) => 5x= -9 => x = -\frac{9}{5}$