Solve for x
x=90
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20+90+80+x=70\times 4
Multiply both sides by 4.
110+80+x=70\times 4
Add 20 and 90 to get 110.
190+x=70\times 4
Add 110 and 80 to get 190.
190+x=280
Multiply 70 and 4 to get 280.
x=280-190
Subtract 190 from both sides.
x=90
Subtract 190 from 280 to get 90.
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