решить уравнение 3(5-2х)+7=3-4х

15-6x+7=3-4x
-6x+4x=3-7-15
-2x=-19
x=-19:(-2)
x=9.5

3*(5-2*x)+7 = 3-4*x
3*5-3*2*x+7 = 3-4*x
22 - 6*x = 3-4*x
-6*x = -19 - 4*x
-2*x = -19 
-2x = -19 / (-2) 
x = 19/2