Summing Singles

Algebra Level 1

1+2+3+4+5+6+7+8+9= ?\color{#20A900}1+ \color{#3D99F6}2+ \color{#D61F06}3+\color{#624F41}4+ \color{magenta} 5+\color{#624F41}6+ \color{#D61F06}7+\color{#3D99F6} 8+\color{#20A900} 9 = \ \color{#FF664D}?

Image Credit: Wikimedia Carl Friedrich Gauß signature
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