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2. a. 180- 40-50=90
b. 180-60-60= 60
c. 100
d.10
e.36
f.61
g.67
h.48
3. a. 2x + x +90 = 180 2x = 2 * 30
3x = 180- 90 = 60
x = 90 : 3
= 30
b. sama cranya yang lain
klo ad yg krng ngerti tanya ajha.. ^^