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46=a+b
a=46-b
U5=a+4b
34=a+4b
substitusi nilai a
34=(46-b)+4b
34=46+3b
3b=34-46
b=-4
a=46-b
a=46-(-4)
a=50
U25=a+24b
U25=50+25(-4)
u25=50-100
U25=-50