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4x=100
x=25
b) 6x+120=-60
6x=-180
x=30
c)1000-5x=-500
1000+500=5x
1500=5x
300=x
4x-30=130
4x=130+30
x=160/4
x=40......... el numero es 40
6x+120=-60
6x=-60-120
x=-180/6
x=-30...........el número es -30
1000-5x=-500
-5x= -500-1000
x= -1500/-5
x=300..............el número es 300