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10y= 4-12
10y= -8
y= -8/10 simplificando 4/5
b) 7x+18=31
7X=31-18
7x= 13
x =13/7
c) 6x + 3 = 2x + 15 pasamos las x a un lado y numeros al otro
6x-2x= 15-3
4x= 12
x= 12/4
×=3
d) 5(2X- 3)=6X+14
quitamos paréntesis multiplicando el 5
10X - 15 = 6x + 14 pasamos todo recuerda cambiar signos
10x-6x = 14 +15
10x= 29
x=29/10
e) 3(×+4)=-5x -36
3×+12=5×-36
3X + 5X = -36 -12
8X= -48
X= -48/8
X= -6