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a)
6x-6+3x = 3x+6
9x-6 = 3x+6
9x-3x = 6+6
6x=12
x= 12÷6
x= 2
Comprobacion:
6x-6+3x = 3x+6
6(2)-6+3(2) = 3(2)+6
12-6+6 = 6+6
6+6= 12
12 = 12
B)
9x+45-5x = 16+5.6+3x
4x+45 = 21.6+3x
4x-3x = 21.6-45
x = -23.4
Comprobacion:
9x+45-5x = 16+5.6+3x
4x+45 = 21.6+3x
4(-23.4) +45 = 21.6+3(-23.4)
-93.6+45 = 21.6-70.2
-48.6 = -48,6
Espero Haber Ayudado
Saludos!
LovelyMoon <3
uwu
perdon si es muy corta