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Răspuns :

a)(x-1)·3=5·6
3x-3=30
3x=30+3
x=33÷3
x=11

b) (x+3)·8=(x+5)·6
8x+24= 6x·30
8x-6x=30-24
2x=6
x=6÷2
x)=3

 c)(2x-1)·10=5·14
20x-10=70
20x=70+10
20x=80
x=80÷20
x=4

d)x(x+1)=2·10
x(x+1)=20
x²+x=20
x=4