To find the value of \( x \) from the equation you provided, we start by simplifying the equation step by step:
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The equation is: \[ 7x - 5 + x + 3 = 90 \]
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Combine like terms: \[ 7x + x - 5 + 3 = 90 \] \[ 8x - 2 = 90 \]
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Next, add 2 to both sides: \[ 8x - 2 + 2 = 90 + 2 \] \[ 8x = 92 \]
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Now, divide both sides by 8 to solve for \( x \): \[ x = \frac{92}{8} = 11.5 \]
Thus, the value of \( x \) is \( 11.5 \).
And to answer your second question, a right angle is defined as having 90 degrees.