5-2x-7-x=4-35-41 7-8+(5x-3)=6 2(x-3)+7-x=25 3(x-2)-2(x+1)=41 5(x-1)+6(x-1)=33

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1. 1.

   $5-2x-7-x=4-35-41$

   $-3x=4-35-41-5+7$

   $-3x=-70$

   `→ x=\frac{70}{3}`

   2.

   $7-8+(5x-3)=6$

   $5x-3=6-7+8$

   $5x=6-7+8+3$

   $5x=10$

   $→x=2$

   3.

   $2(x-3)+7-x=25$

   $2x-6+7-x=25$

   $x=25-7+6$

   $→ x=24$

   4.

   $3(x-2)-2(x+1)=41$

   $3x-6-2x-2=41$

   $x=41+2+6$

   $→x=49$

   5.

   $5(x-1)+6(x-1)=33$

   $5x-5+6x-6=33$

   $11x=33+5+6$

   $11x=44$

   $→x=4$

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2. 5-2x-7-x=4-35-41

   ⇒-3x=4-35-41-5+7

   ⇒-3x=-70

   ⇒x=70/3

   b,7-8+(5x-3)=6

   ⇒5x-3=6-7+8

   ⇒5x=6-7+8+3

   ⇒5x=10

   ⇒x=2

   c,2(x-3)+7-x=25

   ⇒2x-6+7-x=25

   ⇒x=25-7+6

   ⇒x=24

   d,3(x-2)-2(x+1)=41

   ⇒3x-6-2x-2=41

   ⇒x=41+2+6

   ⇒x=49

   e,5(x-1)+6(x-1)=33

   ⇒5x-5+6x-6=33

   ⇒11x=33+5+6

   ⇒11x=44

   ⇒x=4

   Chúc bạn học tốt nhé! ^^

    

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