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18)a)6x+3+2(x-4)=7(x+2)

Răspuns :

6x+3+2(x-4) = 7(x+2)
6x+3+2x-8 = 7x+14
8x-5 = 7x+14
8x-7x = 14+5
x = 19.

Succès ! :)
a)6x+3+2(x-4)=7(x+2)
6x+3+2x-8=7x+14
6x+2x+3-8=7x+14
8x-5=7x+14
8x-7x=5+14
X=19