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a) x = 5
b) 2x - x = 9 + 4
b) x = 5
c) 5x - 4x= -12 + 10
c) x = -2
espero que te ayude
x = 17-12
x = 5
2X - 4=X+9
2x-x = 9 +4
x = 13
5X - 10=4X - 12
5x-4x = -12+10
x = -2