Question

A ) -2x(2y-4)-3y= -5x(3y+9)


B) _(x+3)-2.(-2x-4)=5.(3x-1)-9x+6


C) 8x+3x-(2x-9)=4.(3x-8)+3x




Ajudem ???

Answer 1

A) -2(2y-4) - 3y = -5 (3y+9)
---->-4y + 8 - 3y = - 15y - 45
----> -4y - 3y + 8 = - 15y - 45
----> - 7y + 8 = -15y - 45
----> -7y + 15y = - 45 - 8
----> 8y = -53
----> y = - 53/8

B) ( x + 3 ) - 2 ( -2x - 4 ) = 5 (3x - 1 ) - 9x + 6
----> x + 3 + 4x + 8 = 15x - 5 - 9x + 6
----> x + 4x + 3 + 8 = 15x - 9x - 5 + 6
----> 5x + 11 = 6x + 1
----> 5x - 6x = 1 - 11
----> - x = - 10..(-1)
----> x = 10

C) 8x + 3x - ( 2x - 9) = 4 (3x - 8) + 3x
----> 11x - 2x + 9 = 12x - 32 + 3x
----> 9x + 9 = 12x + 3x - 32
----> 9x + 9 = 15x - 32
----> 9x - 15x = - 32 - 9
----> - 6x = - 41
----> x = -41/-6
----> x = 41/6