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//determine distance of support C from end A
//Refer fig. 3.53
//assume that the support at C is at a distance of x metres from end A
//applying equilibrium conditions
RC=(30+120+50)/2 //kN
RD=RC //kN (Given)
//Taking moment about A
x=(1000+1200-100*12)/200 //m
printf("The required distance is x=%.0f m",x)
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