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138+495-3x=638-5x+995
-3x+5x=638+995-138-495
2x=1633-633
2x=1000
x=1000/2
x=500
solucion 2
276+990-6x=1276-10x+1990
-6x+10x=1276+1990-276-990
4x=3266-1266
4x=2000
x=2000/4
x=500
solucion 3
138+495+5x=638+3x+995
5x-3x=638+995-138-495
2x=1633-633
2x=1000
x=1000/2
x=500
solucion 4
2²(6⁰)-m-7.5=5²-1⁰
4(1)-m-35=25-1
4-m-35=24
m=4-35-24
m=35-28
m=7
solucion 5
7m-7=1-m
7m+m=7+1
8m=8
m=8/8
m=1
solucion 6
3y-2=y-8
3y-y=-8+2
2y=-6
y=-6/2
y=-3
solucion 7
x+2x+3x=2+4+6
6x=12
x=12/6
x=2
solucion 8
3a-1=a+2+a
3a-a-a=2+1
a=3
solucion 9
4m+2-m=m-3+2m
4m-m-m-2m=-3-2
m=-5
saludos