1/4(5-3x)+1/5(2x+7)=4 3/4

1,25-0,75x+0,4x+1,4= 4,75

-0,75+0,4x=2,1

-0,35x=2,1

x=-6

1/4(5-3х)+1/5(2х+7)=4 3/4

1/5-3x + 4/5(2x+7)= 12

1/5-3x + 4/5(2x+7) -12= 0

5(2x+7)+4(5-3x)-60(5-3x)(2x+7)/5(5-3x)(2x+7)=0

10x+35+20-12x-600x-2100+360^2+1260x/ 5(5-3)(2x+7)=0

658x-2045+360x^2=0

360x^2+658x-2045=0

x1/2= -329±√329^2+736200/360