Question

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Answer 1

$\bold \red{answer}$

(49+11)+(-30)=49+{11+30}

Step by step

(49+11)+(-30)=49+{11+___}

(49+11)+(-30)=49+{11+x}

49+11−30=49+11+x

49+11+−30=49+11+x

(49+11+−30)=(x)+(49+11)

30=x+60

30=x+60

x+60=30

x+60−60=30−60

x=−30