Răspuns:
a)3(x-1) - 2x=4<=>2x+5 -x = 12
3x - 3 - 2x = 4 <=> x +5 = 12
x -3 = 4 <=> x = 12-5
x = 4+3 <=> x = 7
x = 7 <=> x = 7
b)4x+2(1-x)= <=>x-3(x+4)=5-2x
4x + 2 -2x = <=> x -3x +12 = 5-2x
2x + 2 = <=> -2x + 12 = 5 -2x
2x + 2 = <=> 12 = 5 + 7
2x + 2 = 2 +2x <=> 12 = 12
0 =0 <=> 0=0
Explicație pas cu pas: