А) 30+15x-5-35x+25=0
50-20x=0, -20x=-50
x=2.5
b) 10x-5=48x-18-5x
10x+5x-48x=-18+5
-33x=-13, x=2.5
v) -30+40x+51=35x+21
40x-35x=21+30-51
15x=0, x=0
г) 6x-15x-10=5x-5-8
-9x-5x=-3, -14x=-3, x=0.21
д) 48x+30=0, 48x=30,
x=0.625
e) 6(8x+5)=-6, 48x+30=-6
48x=-36, x= -0.75
ж) -16x+4=0, -16x=-4, x=0.25
з) -16x+4=-8, -16x=-12
x=0.75