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3 years ago

Use mental math to solve the equation w - (-3) = 7 please help

Mathematics

1 answer:

tester [92]3 years ago

8 0

w-(-3)=7

Pretend that there is a -1 in front of the bracket

w-1(-3)=7

Mutiply the bracket by -1

(-1)(-3)=3

w+3=7

Move +3 to the other side. Sign changes from +3 to -3.

w+3-3=7-3

w=4

Answer: w=4

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