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Step-by-step explanation:
a) 50 + 6x + 4x +3x= 180
13x=180-50
x=130/13
x=10
so, 6x= 6x10=60
4x=40
3x=30
b)50+30+x+x+x+x=180
4x=180-80
x=25
so, all the x values are 25
c)(5x+15)+(2x-10)+(6x-10)+40=360
5x+15+2x-10+6x-10=320
13x=320+5
x=25
so,5x+15=140
2x-10=40
6x-10=140
d)x-5+2x+3+40=180
3x+38=180
3x=142
x=47.3
so, x-5=42.3
2x+3=97.6