361Ա)x+x+3=15, 2x=15-3, 2x=12, x=12÷2=6, 6+3=9
362.Ա) 2x+2x+16=20, 4x=20-16, 4x=4, x=4÷4=1, x=1+8=9
363.Ա) 2x+2x+2=38, 4x=38-2, 4x=36, x=36÷4=9, x=9×2=18, 18+2=20
364.Ա) x+1.5+x+2x+1,4=6,5. 4x=6,5-1,5-1,4, 4x=3,6. x=3,6÷4=0,9
1,5+0,9=2,4 2×0,9+1,4=1,8+1,4=3,2

