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8+7=5x-4x
15=x
x=15
2) 3x + 5 = -2 - 1
3x=-2-1-5
x=-8/3
3) -5x + 7 = 7 - 6x
-5x+6x=7-7
x=0
4) 4 - 3x = -2x - 1
4+1= -2x+3x
x=5
5) 9x = 18
x=18/9
x=2
6) -5x = 20
x=20/-5
x=-4
7) 7x = -21
x=-21/7
x=-3
8) -15x = -45
x=-45/-15
x=3
9) 6x + 9 = 15x -3
9+3=15x-6x
12=9x
x=12/9
x=4/3
10) -2x + 1 = 6x + 4
1-4=6x+2x
-3=8x
x=-3/8
Espero que sirva!Saludos!