Question

Rezolvați ecuatiile :

a) 7 - 4(x + 1) = - 2x + 5 (-x - 3) ;
b) 3x - 4(x + 2) = 2(-x - 1) ;
c) 3(x + 3) - 5( x - 2) = 7(1 - x) + 2( x + 3) ;
d) 5( 2x - 1) + 3x + 11 = 4(x + 3) - 3( 2x + 7).

Answer 1

am rezolvat exercițiul atasat, in poza

Answer 2

a)
7 - 4(x + 1) = - 2x + 5 (-x - 3)
7-4x-4×1= -2x-5x+5×(-3)
7-4x-4= -7x-15
3-4x=-7x-15
-4x+7x= -15-3
3x= -18
x= (-18):3
x= -6










b)
3x - 4(x + 2) = 2(-x - 1)
3x-4x-8= -2x-2
-x-8= -2x-2
-x+2x= -2+8
x=6










c)
3(x + 3) - 5( x - 2) = 7(1 - x) + 2( x + 3)
3x+9-5x+10=7-7x+2x+6
-2x+9+10= -5x+13
-2x+19= -5x+13
-2x+5x=13-19
3x= -6
x= (-6):3
x= -2













d)
5( 2x - 1) + 3x + 11 = 4(x + 3) - 3( 2x + 7)
10x-5+3x+11=4x+12-6x-21
13x+6= -2x -9
13x+2x= -9 -6
15x= -15
x= (-15):15
x= -1