Question

Determinați soluțiile ecuațiilor:
a)7x+4+2(x-5)=8(x+1);

b)2(x+3)-5(2x+1)=12x-19;
d)5(x-2)-2x+3(x+1)=6+7x;
e)-3x+5+6(-x+1)=-4(x+6);
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Answer 1

a)7x+4+2(x-5)=8(x+1)
7x+4+2x-10=8x+8
7x+2x-8x=8-4+10
x=14

b)2(x+3)-5(2x+1)=12x-19
2x+6-10x-5=12x-19
12x+10x-2x=1+19
20x=20
x=20:20
x=1

d)5(x-2)-2x+3(x+1)=6+7x;
5x-10-2x+3x+3=6+7x
6x-10=6+7x
7x-6x=-10-6
x=-16

e)-3x+5+6(-x+1)=-4(x+6)
-3x+5-6x+6=-4x-24
-9x+11=-4x-24
9x-4x=11+24
5x=25
x=25:5
x=5