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Best Answer
It's a simple linear equation in 'x'. Its solution is the number that 'x' must be
in order to make it a true statement. Here's how to find the solution:
x + x + 40 = 100
Subtract 40 from each side of the equation:
x + x = 60
Combine the similar terms on the left side:
2x = 60
Divide each side by 2:
x = 30
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