30-(-y+4.5)=-1.5-152+(-82+a)=-370+70

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Let's simplify each expression separately:

1) 30 - (-y + 4.5
= 30 + y - 4.
= y + 25.5

2) -1.5 - 152 + (-82 + a
= -153.5 + (-82 + a
= a - 235.5

3) -370 + 7
= -300

Therefore, we have:

y + 25.5 = a - 235.5 = -300

This system of equations doesn't have a unique solution as there are two variables (y and a) and only one equation. Further information or additional equations are needed to solve for y and a simultaneously.