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-3x=12
x=12/-3
x=-4
10x +3 -7x - 6x = 5 + 10
10x + 3 - 7x - 6x = 15
10x -7x - 6x =15 - 3
10x -7x -6x = 12
3x - 6x = 12
-3x= 12
x= 12 : -3
x = -4
Comprobamos:
10x + 3 - 7x = 5 + 10 + 6x
10. -4 + 3 - 7. -4 = 5 +10 + 6. -4
-40 + 3 - (-28) = 5 + 10 + -24
-37 - (-28) = 15 + -24
-37 + 28 = 15 + -24 (Suprresión de paréntesis)
-9 = -9