Question

rezolvati urmatoarele ecuatii , umde x este numar natural .
a) 3(x+5)=2(x+10)
b) 5(2x-5)=7(x+3)-19

Answer 1

a)
3(x+5)=2(x+10)
3x+5=2x+20
3x-2x=20-5
x=15
b)
5(2x-5)=7(x+3)-19
10x-25=7x+21-19
10x-7x=25+2
3x=27
x=27:3
x=9