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3x+6x=-42+12
9x=30
x= 30/9= 10/3
2) 3(2x+1)=5x+10
6x+3=5x+10
6x-5x=10-3
x=7
3) (7x+2)(3x-4)=8
21x"-28x+6x-8=8
21x"-28x+6x-8-8=0
21x"-22x-16=0
(en estaecuación, para despejar x, hay que realizar la formula de x)