URGENTLY! I GIVE 20B. Simplify expression 6.36+ and + (-2.9)+ (-4.36)+2.9 and find its value if and =-7 2,9

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6.36+ and + (-2.9)+ (-4.36)+2.9=6.36+ (-7.29)+ (-2.9)+ (-4.36)+2.9 = 6.36+ (-7.29)=-0,93-0.93+ (-2.9)=-3.83-3.83+ (-4.36)=-8.19 - 8.19+2.9=-5.29
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Answer add