Question

Va rog mult , am nevoie urgentă de acest Exercițiu :
Rezolvati ecuatiile in N:
a) 4(x+3)+15(x+1)=3(2x+3)+7(x+4)+8
b)5(2x-3)+4(4x+7)-48=3(2x+1)+4(x+3)+30 c)5(3x+14)+4(2x+13)-15=4(5x+12)+2(x+38)-11 d)9(4x-3)-7(3x+5)=5(3x+10)-4(2x+15)-4
e) 2x(x+1) - 3(x+4) =2x (x-3) +8

Answer 1

a) 4(x+3)+15(x+1)=3(2x+3)+7(x+4)+8
    4x+12+15x+15 = 6x+9+7x+28+8
    19x+27=13x+45
    19x-13x = 45-27
    6x = 18
    x = 3

b) 5(2x-3)+4(4x+7)-48=3(2x+1)+4(x+3)+30  
    10x-15+16x+28-48 = 6x+3+4x+12+30
    26x-35 = 10x+45
    26x-10x = 45+35
    16x = 80
     x = 5

c) 5(3x+14)+4(2x+13)-15=4(5x+12)+2(x+38)-11
    15x+70+8x+52-15 = 20x+48+2x+76-11
    23x+107 = 22x+113
    23x-22x = 113-107
    x = 6

d) 9(4x-3)-7(3x+5)=5(3x+10)-4(2x+15)-4
    36x-27-21x-35 = 15x+50-8x-60-4
    15x-62 = 7x-14
    15x-7x = 62-14
    8x = 48
    x = 6

e) 2x(x+1) - 3(x+4) =2x (x-3) +8
    2x^2+2x-3x-12 = 2x^2-6x+8
    2x^2-x-12 = 2x^2-6x+8
    2x^2-2x^2-x+6x = 12+8
    5x = 20
    x = 4