Respuesta:
A)7X +12= 6X +9
7X-6X=9-12
1X=-3
X=-3÷1
X=-3
7×-3 +12=6×-3+9
-21+12=-18+9
-9=-9
B)4X+1=2X+5
4X-2X=5-1
2X=4
X=4÷2
X=2
4×2+1=2×2+5
8+1=4+5
9=9
C)4X+3=21-2X
4X+2X=21-3
6X=18
X=18÷6
X=3
4×3+3=21-2×3
12+3=21-6
15=15
D)12X-5X=20+8-7
7X=21
X=21÷7
E)4(2X+5)=12
8X+20=12
8X=12-20
8X=-8
X=-8÷8
X=-1
4(2×-1+5)=12
4(-2+5)=12
4×3=12
12=12
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Verified answer
Respuesta:
A)7X +12= 6X +9
7X-6X=9-12
1X=-3
X=-3÷1
X=-3
7×-3 +12=6×-3+9
-21+12=-18+9
-9=-9
B)4X+1=2X+5
4X-2X=5-1
2X=4
X=4÷2
X=2
4×2+1=2×2+5
8+1=4+5
9=9
C)4X+3=21-2X
4X+2X=21-3
6X=18
X=18÷6
X=3
4×3+3=21-2×3
12+3=21-6
15=15
D)12X-5X=20+8-7
7X=21
X=21÷7
X=3
E)4(2X+5)=12
8X+20=12
8X=12-20
8X=-8
X=-8÷8
X=-1
4(2×-1+5)=12
4(-2+5)=12
4×3=12
12=12