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x\times 7-78=216
Divide 390 by 5 to get 78.
x\times 7=216+78
Add 78 to both sides.
x\times 7=294
Add 216 and 78 to get 294.
x=\frac{294}{7}
Divide both sides by 7.
x=42
Divide 294 by 7 to get 42.