Question

1)3×-15=×+3 3)2(×+3)=×+13 5)3(×-2)=×+4

Answer 1

$1)3x - 15 = x + 3 \\ 3x - 15 - x - 3 = 0 \\ 2x - 18 = 0 \\ 2x = 18 \\ x = 18 \div 2 = 9$
$3)2x + 6 = x + 13 \\ 2x + 6 - x - 13 = 0 \\ x - 13 = 0 \\ x = 13$
$5)3(x - 2) = x + 4 \\ 3x - 6 - x - 4 = 0 \\ 2x - 10 = 0 \\ 2x = 10 \\ x = 10 \div 2 = 5$

Answer 2

1) 3x-x=3+15
2x=18
x=9

2) 2x+6=x-13
2x-x=-13-6
x=-19


3) 3x-6=x+4
3x-x=4+6
2x=10
x=5