exam Maths Puzzle Numerical Ability

Please help me solve for a for this equation: {{{ 7.5a+.5b-3.5c=6.5 }}} {{{ 2.5a-3b+4c=5 }}} {{{ 1.5a-5b+2c=-11 }}}

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I need to understand this by having it written out and simplified for me. Thank you.

3. A rectangular box is (4x + 3) feet wide, (5x - 2) feet long, and (3x + 2) feet high. Find the volume of this box. Find the sum or difference. - 11/12 - -7/15






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