Convert the word problem into an equation as follows:
Let's use the variable 'x' for girls and 'x+7' for boys.
x + x + 7 = 29
Combine like terms
2x + 7 = 29
Subtract 7 from both sides
2x = 22
Divide 2 into 22 to get x
x=11 girls
x+7 = 18 Boys
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