Respuesta:
A) 21-6x=27-8x
21-6x-21=278x-21
-6x=8x+6
-6x+8x=-8x+6+8x
2x=6
2x/2 = 6/2
x=3
B) 5y+6y-81=7y+102+65y
11y-81=7y+102+65y
11y-81=7y+65y+102
11y-81=72y+102
11y-81+81=72y+102+81
11y=72y+183
-61y=183
-61y/-61 = 183/-61
Y=-3
C) x-2(2x+3)=9-2(3x+3)
-3x-6=6x+3
-3x-6+6=-6x+3+6
-3x=-6x+9
-3x+6x=-6x+9+6x
3x=9
3x/3 = 9/3
X=3
D) 3(2x+5)-5x=20
x+15=20
x+15-15=20-15
X=5
E) 8x-4+3x=7x+x+14
8x-4+3x=7x+x+14
8x+3x-4=7x+x+14
11x-4=8x+14
11x-4+4=8x+14+4
11x=8x+18
11x-8x=8x+18-8x
3x=18
3x/3 = 18/3
X=6
F) 5(x-1)+16(2x+3)=5x-21
37x+43=5x-21
37x+43-43=5x-21-43
37x=5x-64
37x-5x=5x-64-5x
32x=-64
32x/32 = - 64/32
X=-2
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Respuesta:
A) 21-6x=27-8x
21-6x-21=278x-21
-6x=8x+6
-6x+8x=-8x+6+8x
2x=6
2x/2 = 6/2
x=3
B) 5y+6y-81=7y+102+65y
11y-81=7y+102+65y
11y-81=7y+65y+102
11y-81=72y+102
11y-81+81=72y+102+81
11y=72y+183
-61y=183
-61y/-61 = 183/-61
Y=-3
C) x-2(2x+3)=9-2(3x+3)
-3x-6=6x+3
-3x-6+6=-6x+3+6
-3x=-6x+9
-3x+6x=-6x+9+6x
3x=9
3x/3 = 9/3
X=3
D) 3(2x+5)-5x=20
x+15=20
x+15-15=20-15
X=5
E) 8x-4+3x=7x+x+14
8x-4+3x=7x+x+14
8x+3x-4=7x+x+14
11x-4=8x+14
11x-4+4=8x+14+4
11x=8x+18
11x-8x=8x+18-8x
3x=18
3x/3 = 18/3
X=6
F) 5(x-1)+16(2x+3)=5x-21
37x+43=5x-21
37x+43-43=5x-21-43
37x=5x-64
37x-5x=5x-64-5x
32x=-64
32x/32 = - 64/32
X=-2