Could someone explain

Answer:
top one =75
bottom one=65
Step-by-step explanation:
all angles should equal to 180
so 180-40=140
the sum of th eother two angles will be 140
so 4x-5+3x+5=140
now solve for x
x=20
subsitute for x
4(20)-5=75
3(20)+5=65
please mark brainliest if correct