Basic Javascript challenges can we clubbed

Basic Javascript challenges can we clubbed
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#1

I am currently learning javascript and i am finding it boring to do the similar challenges like
challenge 1
var a = 5;
a += 6 ;

challenge 2
var a = 5;
a -= 6;

challenge 3
var a = 5;
a *= 6;
They can be clubbed into a single challenge where the learner can practice with the different signs into a single challenge .