Question

5*(x-1,2)+4x = 21,054
2*(x-5,5)+3*(x+1,6)=4*(x-5,4)
x+2x+3x+4x+5x=6x+7x +17,045
12x-0,154=7x-0,05
7*(x-1)+4,5=2*(x-1)+9,12

Answer 1

5*(x-1,2)+4x = 21,054
5x-6+4x=21,054
9x=21,054+6
9x=27,054
x=3,006

2*(x-5,5)+3*(x+1,6)=4*(x-5,4)
2x-11+3x+4,8=4x-21,6
5x-4x=11-4,8-21,6
x=-15,4

x+2x+3x+4x+5x=6x+7x +17,045
15x-13x=17,045
2x=17,075
x=8,5375

12x-0,154=7x-0,05 
5x=0,104
x=0,0208

7*(x-1)+4,5=2*(x-1)+9,12
7x-7+4,5=2x-2+9,12
5x=7,12+7-4,5
5x=9,62
x=1,924