Explicación paso a paso:
1) 2x+1= 7
2x=7-1
x= 6/2
x= 3
Comprobación:
2(3)+1=7
6+1=7
7=7
2) 6x+15=81
6x= 81-15
x= 66/6
x= 11
Demostración:
6(11)+15=81
66+15=81
81=81
3) 4x-3= -x+8
4x+x=8+3
5x= 11
x=11/5
x=2.2
4(2.2)-3= -2.2+8
8.8-3 = -2.2+8
5.8 = 5.8
4) 5x+2=3x+16
5x-3x=16-2
2x=14
x= 14/2
x= 7
5(7)+2=3(7)+16
35+2 = 21+16
37 = 37
5) 12x + 5 - 3x= 5x + 30 -x
12x - 3x - 5x + x = 30 - 5
5x= 25
x= 25/5
x= 5
12(5)+5-3(5)=5(5)+30-5
60+5-15= 25+30-5
50 = 50
Espero te sirva :).
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Verified answer
Explicación paso a paso:
1) 2x+1= 7
2x=7-1
x= 6/2
x= 3
Comprobación:
2(3)+1=7
6+1=7
7=7
2) 6x+15=81
6x= 81-15
x= 66/6
x= 11
Demostración:
6(11)+15=81
66+15=81
81=81
3) 4x-3= -x+8
4x+x=8+3
5x= 11
x=11/5
x=2.2
Demostración:
4(2.2)-3= -2.2+8
8.8-3 = -2.2+8
5.8 = 5.8
4) 5x+2=3x+16
5x-3x=16-2
2x=14
x= 14/2
x= 7
Demostración:
5(7)+2=3(7)+16
35+2 = 21+16
37 = 37
5) 12x + 5 - 3x= 5x + 30 -x
12x - 3x - 5x + x = 30 - 5
5x= 25
x= 25/5
x= 5
Demostración:
12(5)+5-3(5)=5(5)+30-5
60+5-15= 25+30-5
50 = 50
Espero te sirva :).