tolong bantu dijawab ya please,,!!!:v

10x + 5 = 15x + 20
10x - 15x = 20 - 5
-5x = 15
x = 3

-7 + 3x = 4x - 10
3x - 4x = -10 + 7
-× = -3
x = 3
jadikan jawaban terbaik ya, thx