（-7）×（-5）-90÷（-15）．

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Worked solution

1. 计算乘法与除法部分

根据有理数混合运算的顺序，先算乘除，后算加减：
(−7)×(−5)=35(-7) \times (-5) = 35
90÷(−15)=−690 \div (-15) = -6

2. 计算减法得出最终结果

将乘除法的结果代回原式进行减法运算：
35−(−6)=35+6=4135 - (-6) = 35 + 6 = 41

Answer

41

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