Răspuns :
Răspuns:
a. 10x-5+3x-3-42x+72=120-15x-84
10x+3x-42x+15x=120-84+5+3-72
-14x=-28
x=28:14
x=2
b. 6x+8-3x-2=12x-18+6-8x+10x-15
6x-3x-12x+8x-10x=-18+6-15-8+2
-11x=-33
x=33:11
x=3
Răspuns:
[tex]\bf \red{a)~~x=2}[/tex]
[tex]\bf \blue{b)~~x=3}[/tex]
Explicație pas cu pas:
[tex]\bf a)~5(2x-1)+3(x-1)-6(7x-12)=15(8-x)-84[/tex]
[tex]\bf 10x-5+3x-3-42x+72=120-15x-84[/tex]
[tex]\bf 10x+3x-42x+64=36-15x[/tex]
[tex]\bf 10x+3x-42x+15x=36-64[/tex]
[tex]\bf -14x=-28~~~~\bigg|:(-14)[/tex]
[tex]\bf \red{\underline{x=2}}[/tex]
[tex]\bf b)~~2(3x+4)-3x-2=6(2x-3)+2(3-4x)+5(2x-3)[/tex]
[tex]\bf 6x+8-3x-2=12x-18+6-8x+10x-15[/tex]
[tex]\bf 3x+6=14x-27[/tex]
[tex]\bf 3x+6+27=14x[/tex]
[tex]\bf 3x+33=14x[/tex]
[tex]\bf 33=14x-3x[/tex]
[tex]\bf 33=11x[/tex]
[tex]\bf x = 33:11[/tex]
[tex]\bf \blue{\underline{x=3}}[/tex]
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