2( 1.5x + 2.4) - ( 2x + 3) = -0.2

2(1.5х + 2.4) - (2х + 3) = -0.2

3х + 4.8 - 2х - 3 = -0.2

3х - 2х = -0.2 -4.8 + 3

либо можно так 3х - 2х = 3- 4.8 - 0.2

х= -5 +3

х = -2

проверка

2* (1.5 *(-2) + 2.4 ) - ( 2*(-2) + 3) = -0.2

2 * ( -3 + 2.4 ) - (-1) = -0.2

2 *(-0.6)+1 = -0.2

-1.2 +1= -0.2

-0.2 = -0.2